Peterson Cartridge Brass - 7mm Remington Magnum "LONG" – NEW - QTY 50
Peterson High Performance Brass Cases – Unprimed
Peterson makes the traditional SAAMI spec’d version that headspaces off the belt. But it also makes a version that headspaces off the shoulder. Peterson calls that version the 7Rem Mag "Long". This listing is the LONG spec version.
Peterson's Match-Grade Brass rifle casings are manufactured on a new, state-of-the-art case line which uses cutting-edge technology to produce some of the most precise and consistent casings on the market. We are committed to producing Match-Grade Brass that enables our customers to get more reloads per casing than industry average.
Remington hit a home run back in 1962 when they introduced their new Model 700 bolt action rifle, along with a brand-new belted magnum cartridge, the 7mm Remington Magnum. It became an instant hit with big game hunters and shooters largely due to its versatility and longer barrel life compared to Winchester’s .264 Winchester Magnum. Fifty-eight years later, the 7mm Remington Magnum remains among the top selling and most widely produced magnum rifle calibers.
Derek Peterson, President of Peterson Cartridge states, “We have been working on belted magnums for a while now, and with some lessons learned and a few tweaks, we released our .300 Win. Mag. The 7mm Remington Mag. was logically next on our list.” He continues, “We wanted to provide belted magnum shooters the same level of quality casings as the rest of our product line, and these are no exception. Give them a shot and let us know what you think.”
Our Match-Grade Brass rifle casings are manufactured on a new, state-of-the-art case line which uses cutting-edge technology to produce some of the most precise and consistent casings on the market, but we are still committed to ensuring the quality of the product our machines produce. We are committed to producing Match-Grade Brass that enables our customers to get more reloads per casing than industry average.
The LONG of it:
(Note: The write up below refers to the 300WM, the same principle applies to the 7RM).
Derek 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.
“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.
“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.”
Peterson 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.”
Peterson 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.”
* Our Peterson Cartridge brass is purchased in bulk (loose) and repackaged in the quantity noted. While in bulk case mouths can become slightly bent or dinged, brass should be sized to shape the necks and mouths and to insure that it is properly sized for your chamber and bullets.
* This is new factory brass, it will not be packaged in retail packaging.