{"id":3554,"date":"2026-07-26T22:27:53","date_gmt":"2026-07-26T22:27:53","guid":{"rendered":"https:\/\/landmarkfirearms.com\/ca\/?post_type=product&#038;p=3554"},"modified":"2026-07-26T22:28:05","modified_gmt":"2026-07-26T22:28:05","slug":"weatherby-brass-338-378-weatherby-magnum-box-of-20","status":"publish","type":"product","link":"https:\/\/landmarkfirearms.com\/ca\/product\/weatherby-brass-338-378-weatherby-magnum-box-of-20\/","title":{"rendered":"Weatherby Brass 338-378 Weatherby Magnum Box of 20"},"content":{"rendered":"<section id=\"overview\" class=\"product-information stack-l\">\n<h1 class=\"text-left heading-main\" style=\"text-align: center;\">Buy Weatherby Brass 338-378 Weatherby Magnum<\/h1>\n<h2 class=\"bg-blue-dark text-white stack-m inset-squish-m text-transform-none\">Product Overview<\/h2>\n<div class=\"product-section-wrapper\">\n<div class=\"grid product-section-content\">\n<div class=\"product-section-overview\">\n<p>Buy Weatherby Brass 338-378 Weatherby Magnum. Produced exclusively for Weatherby by Norma Precision. Brass has CNC-machined primer pockets and is made to match-grade specifications. New unprimed brass. This is not loaded ammunition.<\/p>\n<p><b>Brass Preparation:\u00a0<\/b>With bulk rifle brass you may sometimes notice a few case mouths are \u201cout of round\u201d or slightly dented below the shoulder.\u00a0 These imperfections occur in the final tumbling wash operation after the case mouth has been annealed.\u00a0 Buy Weatherby Brass 338-378 Weatherby Magnum. Brass manufacturers are aware of the case cosmetics and have worked to mitigate it, but due to equipment design, denting may still occur.\u00a0 Minor dents are normally removed in the first firing and will not affect case life or performance.\u00a0 On non-plated brass, you may also notice all the anneal stain might not be polished off, which may give the case neck a pinkish color.\u00a0 With some smaller caliber cases you may notice the case mouths to be slightly belled.<\/p>\n<p>With all new rifle brass, you should first straighten out the case and case mouth, then chamfer and debur the case mouth inside and out. \u00a0To straighten the case mouth, run the case part way into the sizer die and let the expander ball straighten the brass.\u00a0 To prevent the case neck from stretching, be sure to lubricate the case neck inside the case mouth. Buy Weatherby Brass 338-378 Weatherby Magnum<\/p>\n<p>&nbsp;<\/p>\n<\/div>\n<div class=\"product-section-logos\"><a class=\"inline-block\" href=\"https:\/\/www.midwayusa.com\/weatherby\/b?bid=2107\" aria-label=\"Shop Weatherby products\"><img decoding=\"async\" class=\"product-section-logo\" src=\"https:\/\/media.mwstatic.com\/images\/vendorlogos\/2107.jpg?imwidth=150\" alt=\"Weatherby logo\" width=\"150\" height=\"150\" \/><\/a><\/div>\n<\/div>\n<div class=\"prop-banner\"><img decoding=\"async\" class=\"inline-block margin-right-xs\" src=\"https:\/\/media.mwstatic.com\/external\/fonts\/fontawesome\/svg\/prop-65-warning-v1.svg\" alt=\"warning-icon\" width=\"16\" height=\"14\" aria-hidden=\"true\" \/><strong>WARNING:\u00a0<\/strong>This product can expose you to Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to &#8211; www.P65Warnings.ca.gov.<\/div>\n<\/div>\n<\/section>\n<section id=\"specifications\" class=\"stack-l\">\n<h2 class=\"bg-blue-dark text-white stack-m inset-squish-m text-transform-none\">Specifications<\/h2>\n<div class=\"product-section-wrapper product-specifications\">\n<h3>Product Information<\/h3>\n<table class=\"product-specs-table padding-none stack-l width-100\">\n<tbody>\n<tr class=\"product-specs-table-container \">\n<td class=\"product-specs-table-detail\">Cartridge<\/td>\n<td class=\"product-specs-table-definition\">338-378 Weatherby Magnum<\/td>\n<\/tr>\n<tr class=\"product-specs-table-container is-selectable\">\n<td class=\"product-specs-table-detail\">Finish<\/td>\n<td class=\"product-specs-table-definition\">Brass<\/td>\n<\/tr>\n<tr class=\"product-specs-table-container \">\n<td class=\"product-specs-table-detail\">Condition<\/td>\n<td class=\"product-specs-table-definition\">New<\/td>\n<\/tr>\n<tr class=\"product-specs-table-container is-selectable\">\n<td class=\"product-specs-table-detail\">Quantity<\/td>\n<td class=\"product-specs-table-definition\">20 Piece<\/td>\n<\/tr>\n<tr class=\"product-specs-table-container \">\n<td class=\"product-specs-table-detail\">Primed<\/td>\n<td class=\"product-specs-table-definition\">No<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3 id=\"delivery\">Delivery Information<\/h3>\n<table class=\"product-specs-table padding-none stack-l width-100\">\n<tbody>\n<tr class=\"product-specs-table-container\">\n<td class=\"product-specs-table-detail\">Shipping Weight<button class=\"fas fa-question-circle tooltip-question-btn\" type=\"button\" aria-label=\"Open Tooltip about Shipping Weight\"><\/button><\/td>\n<td class=\"product-specs-table-definition\">1.000 Pounds<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/section>\n","protected":false},"excerpt":{"rendered":"<ul class=\"product-identifiers stack-m\">\n<li class=\"text-bold\">Product #:\u00a0323560<\/li>\n<li class=\"vendor-product-number\">\u00a0Manufacturer #:\u00a0BRASS333<\/li>\n<li class=\"upc-number\">\u00a0UPC #:\u00a0747115070749<\/li>\n<\/ul>\n","protected":false},"featured_media":3581,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[],"product_cat":[162],"product_tag":[],"class_list":["post-3554","product","type-product","status-publish","product_cat-reloading-brass","first","instock","shipping-taxable","purchasable","product-type-simple"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Buy Weatherby Brass 338-378 Weatherby Magnum | Canada<\/title>\n<meta name=\"description\" content=\"Buy Weatherby Brass 338-378 Weatherby Magnum. Produced exclusively for Weatherby by Norma Precision. Brass has CNC-machined primer pockets and is made to match-grade specifications. New unprimed brass. This is not loaded ammunition.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/landmarkfirearms.com\/ca\/product\/weatherby-brass-338-378-weatherby-magnum-box-of-20\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Buy Weatherby Brass 338-378 Weatherby Magnum | Canada\" \/>\n<meta property=\"og:description\" content=\"Buy Weatherby Brass 338-378 Weatherby Magnum. Produced exclusively for Weatherby by Norma Precision. Brass has CNC-machined primer pockets and is made to match-grade specifications. New unprimed brass. This is not loaded ammunition.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/landmarkfirearms.com\/ca\/product\/weatherby-brass-338-378-weatherby-magnum-box-of-20\/\" \/>\n<meta property=\"og:site_name\" content=\"Canada\" \/>\n<meta property=\"article:modified_time\" content=\"2026-07-26T22:28:05+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/landmarkfirearms.com\/ca\/wp-content\/uploads\/sites\/2\/2026\/07\/Buy-Weatherby-Brass-338-378-Weatherby-Magnum-.png\" \/>\n\t<meta property=\"og:image:width\" content=\"558\" \/>\n\t<meta property=\"og:image:height\" content=\"512\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/landmarkfirearms.com\\\/ca\\\/product\\\/weatherby-brass-338-378-weatherby-magnum-box-of-20\\\/\",\"url\":\"https:\\\/\\\/landmarkfirearms.com\\\/ca\\\/product\\\/weatherby-brass-338-378-weatherby-magnum-box-of-20\\\/\",\"name\":\"Buy Weatherby Brass 338-378 Weatherby Magnum | Canada\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/landmarkfirearms.com\\\/ca\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/landmarkfirearms.com\\\/ca\\\/product\\\/weatherby-brass-338-378-weatherby-magnum-box-of-20\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/landmarkfirearms.com\\\/ca\\\/product\\\/weatherby-brass-338-378-weatherby-magnum-box-of-20\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/landmarkfirearms.com\\\/ca\\\/wp-content\\\/uploads\\\/sites\\\/2\\\/2026\\\/07\\\/Buy-Weatherby-Brass-338-378-Weatherby-Magnum-.png\",\"datePublished\":\"2026-07-26T22:27:53+00:00\",\"dateModified\":\"2026-07-26T22:28:05+00:00\",\"description\":\"Buy Weatherby Brass 338-378 Weatherby Magnum. Produced exclusively for Weatherby by Norma Precision. Brass has CNC-machined primer pockets and is made to match-grade specifications. New unprimed brass. This is not loaded ammunition.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/landmarkfirearms.com\\\/ca\\\/product\\\/weatherby-brass-338-378-weatherby-magnum-box-of-20\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/landmarkfirearms.com\\\/ca\\\/product\\\/weatherby-brass-338-378-weatherby-magnum-box-of-20\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/landmarkfirearms.com\\\/ca\\\/product\\\/weatherby-brass-338-378-weatherby-magnum-box-of-20\\\/#primaryimage\",\"url\":\"https:\\\/\\\/landmarkfirearms.com\\\/ca\\\/wp-content\\\/uploads\\\/sites\\\/2\\\/2026\\\/07\\\/Buy-Weatherby-Brass-338-378-Weatherby-Magnum-.png\",\"contentUrl\":\"https:\\\/\\\/landmarkfirearms.com\\\/ca\\\/wp-content\\\/uploads\\\/sites\\\/2\\\/2026\\\/07\\\/Buy-Weatherby-Brass-338-378-Weatherby-Magnum-.png\",\"width\":558,\"height\":512},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/landmarkfirearms.com\\\/ca\\\/product\\\/weatherby-brass-338-378-weatherby-magnum-box-of-20\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/landmarkfirearms.com\\\/ca\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Shop\",\"item\":\"https:\\\/\\\/landmarkfirearms.com\\\/ca\\\/shop\\\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Weatherby Brass 338-378 Weatherby Magnum Box of 20\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/landmarkfirearms.com\\\/ca\\\/#website\",\"url\":\"https:\\\/\\\/landmarkfirearms.com\\\/ca\\\/\",\"name\":\"Canada\",\"description\":\"Premium Guns, Ammo &amp; Tactical Gear\",\"publisher\":{\"@id\":\"https:\\\/\\\/landmarkfirearms.com\\\/ca\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/landmarkfirearms.com\\\/ca\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/landmarkfirearms.com\\\/ca\\\/#organization\",\"name\":\"Canada\",\"url\":\"https:\\\/\\\/landmarkfirearms.com\\\/ca\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/landmarkfirearms.com\\\/ca\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/landmarkfirearms.com\\\/ca\\\/wp-content\\\/uploads\\\/sites\\\/2\\\/2026\\\/07\\\/logo-land.png\",\"contentUrl\":\"https:\\\/\\\/landmarkfirearms.com\\\/ca\\\/wp-content\\\/uploads\\\/sites\\\/2\\\/2026\\\/07\\\/logo-land.png\",\"width\":927,\"height\":221,\"caption\":\"Canada\"},\"image\":{\"@id\":\"https:\\\/\\\/landmarkfirearms.com\\\/ca\\\/#\\\/schema\\\/logo\\\/image\\\/\"}}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Buy Weatherby Brass 338-378 Weatherby Magnum | Canada","description":"Buy Weatherby Brass 338-378 Weatherby Magnum. Produced exclusively for Weatherby by Norma Precision. Brass has CNC-machined primer pockets and is made to match-grade specifications. New unprimed brass. This is not loaded ammunition.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/landmarkfirearms.com\/ca\/product\/weatherby-brass-338-378-weatherby-magnum-box-of-20\/","og_locale":"en_US","og_type":"article","og_title":"Buy Weatherby Brass 338-378 Weatherby Magnum | Canada","og_description":"Buy Weatherby Brass 338-378 Weatherby Magnum. Produced exclusively for Weatherby by Norma Precision. Brass has CNC-machined primer pockets and is made to match-grade specifications. New unprimed brass. This is not loaded ammunition.","og_url":"https:\/\/landmarkfirearms.com\/ca\/product\/weatherby-brass-338-378-weatherby-magnum-box-of-20\/","og_site_name":"Canada","article_modified_time":"2026-07-26T22:28:05+00:00","og_image":[{"width":558,"height":512,"url":"https:\/\/landmarkfirearms.com\/ca\/wp-content\/uploads\/sites\/2\/2026\/07\/Buy-Weatherby-Brass-338-378-Weatherby-Magnum-.png","type":"image\/png"}],"twitter_card":"summary_large_image","twitter_misc":{"Est. reading time":"2 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/landmarkfirearms.com\/ca\/product\/weatherby-brass-338-378-weatherby-magnum-box-of-20\/","url":"https:\/\/landmarkfirearms.com\/ca\/product\/weatherby-brass-338-378-weatherby-magnum-box-of-20\/","name":"Buy Weatherby Brass 338-378 Weatherby Magnum | Canada","isPartOf":{"@id":"https:\/\/landmarkfirearms.com\/ca\/#website"},"primaryImageOfPage":{"@id":"https:\/\/landmarkfirearms.com\/ca\/product\/weatherby-brass-338-378-weatherby-magnum-box-of-20\/#primaryimage"},"image":{"@id":"https:\/\/landmarkfirearms.com\/ca\/product\/weatherby-brass-338-378-weatherby-magnum-box-of-20\/#primaryimage"},"thumbnailUrl":"https:\/\/landmarkfirearms.com\/ca\/wp-content\/uploads\/sites\/2\/2026\/07\/Buy-Weatherby-Brass-338-378-Weatherby-Magnum-.png","datePublished":"2026-07-26T22:27:53+00:00","dateModified":"2026-07-26T22:28:05+00:00","description":"Buy Weatherby Brass 338-378 Weatherby Magnum. Produced exclusively for Weatherby by Norma Precision. Brass has CNC-machined primer pockets and is made to match-grade specifications. New unprimed brass. This is not loaded ammunition.","breadcrumb":{"@id":"https:\/\/landmarkfirearms.com\/ca\/product\/weatherby-brass-338-378-weatherby-magnum-box-of-20\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/landmarkfirearms.com\/ca\/product\/weatherby-brass-338-378-weatherby-magnum-box-of-20\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/landmarkfirearms.com\/ca\/product\/weatherby-brass-338-378-weatherby-magnum-box-of-20\/#primaryimage","url":"https:\/\/landmarkfirearms.com\/ca\/wp-content\/uploads\/sites\/2\/2026\/07\/Buy-Weatherby-Brass-338-378-Weatherby-Magnum-.png","contentUrl":"https:\/\/landmarkfirearms.com\/ca\/wp-content\/uploads\/sites\/2\/2026\/07\/Buy-Weatherby-Brass-338-378-Weatherby-Magnum-.png","width":558,"height":512},{"@type":"BreadcrumbList","@id":"https:\/\/landmarkfirearms.com\/ca\/product\/weatherby-brass-338-378-weatherby-magnum-box-of-20\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/landmarkfirearms.com\/ca\/"},{"@type":"ListItem","position":2,"name":"Shop","item":"https:\/\/landmarkfirearms.com\/ca\/shop\/"},{"@type":"ListItem","position":3,"name":"Weatherby Brass 338-378 Weatherby Magnum Box of 20"}]},{"@type":"WebSite","@id":"https:\/\/landmarkfirearms.com\/ca\/#website","url":"https:\/\/landmarkfirearms.com\/ca\/","name":"Canada","description":"Premium Guns, Ammo &amp; Tactical Gear","publisher":{"@id":"https:\/\/landmarkfirearms.com\/ca\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/landmarkfirearms.com\/ca\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/landmarkfirearms.com\/ca\/#organization","name":"Canada","url":"https:\/\/landmarkfirearms.com\/ca\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/landmarkfirearms.com\/ca\/#\/schema\/logo\/image\/","url":"https:\/\/landmarkfirearms.com\/ca\/wp-content\/uploads\/sites\/2\/2026\/07\/logo-land.png","contentUrl":"https:\/\/landmarkfirearms.com\/ca\/wp-content\/uploads\/sites\/2\/2026\/07\/logo-land.png","width":927,"height":221,"caption":"Canada"},"image":{"@id":"https:\/\/landmarkfirearms.com\/ca\/#\/schema\/logo\/image\/"}}]}},"_links":{"self":[{"href":"https:\/\/landmarkfirearms.com\/ca\/wp-json\/wp\/v2\/product\/3554","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/landmarkfirearms.com\/ca\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/landmarkfirearms.com\/ca\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/landmarkfirearms.com\/ca\/wp-json\/wp\/v2\/comments?post=3554"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/landmarkfirearms.com\/ca\/wp-json\/wp\/v2\/media\/3581"}],"wp:attachment":[{"href":"https:\/\/landmarkfirearms.com\/ca\/wp-json\/wp\/v2\/media?parent=3554"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/landmarkfirearms.com\/ca\/wp-json\/wp\/v2\/product_brand?post=3554"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/landmarkfirearms.com\/ca\/wp-json\/wp\/v2\/product_cat?post=3554"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/landmarkfirearms.com\/ca\/wp-json\/wp\/v2\/product_tag?post=3554"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}