{"product_id":"peterson-brass-300-winchester-mag-long-unprimed-bulk-box-of-250","title":"Peterson 300 Winchester Magnum Long Brass Box of 250","description":"\u003cp\u003eThis is a Bulk package of Peterson Cartridge casings, they will not come in one of their plastic ammo boxes.\u003c\/p\u003e\n\n\u003cp\u003eMade in the U.S.A.\u003c\/p\u003e\n\n\u003cp\u003eMatch-Grade is a standard that must be held throughout the entire process of manufacturing some of the most consistent, accurate, and durable brass rifle casings available today. From Peterson's small batch production lines to their quality control department, to your bench, and on to the range. Match-grade is the standard that Peterson strives to achieve so that customers can maintain that standard all the way to the target.\u003c\/p\u003e\n\n\u003cp\u003ePeterson Cartridge Co. of Pittsburgh, PA announced it is producing .300 Win Mag casings in two versions. Peterson makes the \u003ca href=\"https:\/\/www.grafs.com\/retail\/catalog\/product\/productId\/77495\" target=\"_blank\"\u003etraditional SAAMI spec’d\u003c\/a\u003e version that headspaces off the belt. But it also makes a version that headspaces off the shoulder. Peterson calls this version the .300 Win Mag Long.\u003c\/p\u003e\n\n\u003cp\u003eShooters that reload .300 Win Mag casings have often wished they could get more reloads from their casings. Well now you can!\u003c\/p\u003e\n\n\u003cp\u003eDerek Peterson, president of Peterson Cartridge explains, “Traditional .300 Win Mag casings tend to show signs of case head separation after only 5 to 7 firings.\u003c\/p\u003e\n\n\u003cp\u003e“Here’s why. The SAAMI specs for any caliber, list a minimum and a maximum tolerance for each dimension on the casing and the rifle’s chamber. With most calibers, the max dimension of the casing, for length-to-shoulder (L-T-S), has the shoulder of the casing right up against the chamber wall. With .300 Win Mag, unlike most other calibers, if your rifle’s chamber is cut to the SAAMI minimum for L-T-S, and your casing is at the max length-to-shoulder dimension, the casing shoulder is still .0095” away from the chamber wall. With the same minimum rifle chamber, a casing at nominal L-T-S is .012” away from the chamber wall. In a worst-case scenario, if the casing was produced at the SAAMI minimum L-T-S, and the chamber was cut at the maximum L-T-S dimension, the casing shoulder could be up to .026” away from the chamber wall. That might not sound like a lot, but it is.\u003c\/p\u003e\n\n\u003cp\u003e“That large gap is what causes the casing to stretch so much when it is fired. It’s that stretching that causes premature case head separation.”\u003c\/p\u003e\n\n\u003cp\u003ePeterson continued, “With Peterson .300 Win Mag- Long casings, we make them with a longer L-T-S dimension. All the other dimensions are SAAMI spec. But the longer L-T-S prevents the casing from stretching excessively on the 1st firing. The casing has more support, which translates to less stretching, which translates to longer case life.”\u003c\/p\u003e\n\n\u003cp\u003ePeterson concluded, “If you are a handloader, that wants more reloads from your .300 Win Mag casings, we think you will appreciate our new .300 Win Mag - Long casings. I’d like it if you’d give them a try and let us know what you think.”\u003c\/p\u003e\n\n\u003cp\u003e \u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003eWarning: Only use Peterson Cartridge Co. casings in firearms in good condition, designed, marked, and chambered for this cartridge. Do not use Peterson Cartridge Co casings for “fire forming” or any other purpose other than what they were designed and tested for. Peterson retains no responsibility for the enclosed casings if they are used outside of the manufacturer’s recommendations. \u003c\/em\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis is not loaded ammunition.\u003c\/p\u003e","brand":"Peterson Cartridge Company","offers":[{"title":"Default Title","offer_id":46623906300035,"sku":"PCC300WML250","price":381.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0669\/5128\/2819\/files\/85616.jpg?v=1772034865","url":"https:\/\/grafs.com\/products\/peterson-brass-300-winchester-mag-long-unprimed-bulk-box-of-250","provider":"Graf \u0026 Sons","version":"1.0","type":"link"}