Peterson Brass 300 Norma Mag Unprimed Box of 50

Item #:PCC300NM50
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Peterson Brass 300 Norma Mag Unprimed Box of 50
Peterson Brass 300 Norma Mag Unprimed Box of 50
Peterson Brass 300 Norma Mag Unprimed Box of 50
Due to the packaging and shipping process, case necks are often slightly dinged or bent and need to be rounded up and sized to give proper neck tension. New and/or fired cases must be full-length resized or have the expander ball of the sizing die run through the case neck prior to loading.
Read 5 Reviews

Product Information

All Peterson Cartridge casings come in one of their plastic ammo boxes. 

Made in the U.S.A.

The .300 Norma Magnum is a cartridge that has begun to gain popularity in the long range shooting community. The .300 Norma Magnum is a .338 Norma Magnum case necked down to .308 caliber. This cartridge was named .300 Norma Magnum to differentiate it from the .308 Norma Magnum designed in 1960. The United States Special Operations Command (SOCOM) has selected .300 Norma Magnum as their new Advanced Sniper Rifle Cartridge (2016).   C.I.P. listed this cartridge in 2012 with a max pressure of 4400 bar.

Warning: 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.

This is not loaded ammunition.

NOTICE - THIS IS THE FIRST RUN: Due to popular demand, Peterson Cartridge released its .300 Norma Magnum and .338 Norma Magnum casings in the spring of 2018. When Peterson designed these casings, it chose to use the same parent casing as its .338 Lapua Magnum casing. As a result, Peterson chose to keep the major diameter of the casing (the diameter just above the extraction groove) the same size as its .338 Lapua Magnum casings. That diameter is .580”. Since Peterson has never had any complaints about excessive major diameter growth, or primer pocket loosening in its .338 Lapua Magnum casings, they believed that to be a fine decision. 

After releasing its 1st production run of .300 and .338 Norma Magnum casings with a major diameter of .580”, it was brought to Peterson’s attention that some customers would rather the major diameter of the Peterson .300 and .338 Norma Magnum casings be the same size as the .300 and .338 Norma Magnum casings produced by Norma. That diameter is .583”.

Peterson has received a lot of compliments on its first run of .300 and .338 Norma Magnum brass. Customers have stated that the Peterson casings hold more pressure, and that they can get more reloads. Several have said things, like this customer who enthused, “The Peterson Brass I’ve been testing in .300 Norma Mag is by far the best .300 Norma Mag brass I’ve used to date. The accuracy is outstanding.”

After studying the potential problems associated with changing its .300 and .338 Norma Magnum major diameter, Peterson decided to modify its tooling to change the major diameter of its .300 and .338 Norma Magnum casings to match Norma’s major diameter which is .583”. As a result, all future production runs of Peterson’s .300 and .338 Norma Magnum casings will have a major diameter of .583” to match the Norma Magnum casings produced by Norma.

Read 5 Reviews - Average Rating: 5 stars

300 norma peterson brass

By Jason W. on Nov 16, 2018
Awesome brass. You will not be disappointed


By Mario Q. on Nov 05, 2018
Brass looks great. Haven’t shot it yet but will soon

300 Norma Mag Bress

By Terry A. on Oct 11, 2018
I love this brass. Its base is very hard so it lasts a long time without expanding the primer pocket. And it is very uniform in sizing and overall weight.


By James M. on Aug 24, 2018
very well made brass , consistent, Like how they ship their brass in ammo boxes with foam padding to protect case mouth from dings in shipping unlike other manufacturers.

Will purchase more going forward.

300 Norma Mag-Peterson brass

By Geno V. on Aug 07, 2018
So far I am really liking this brass. It is of Lapua quality. I have 7 loads on 1 piece, primer pocket still tight. Is working much better for me than the Norma brand.
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