Peterson Unprimed Rifle Brass – .300 RUM, 50/ct

The Peterson Unprimed Rifle Brass – .300 RUM, 50/ct (Peterson part no. 40070-R) delivers match-grade unprimed rifle brass built for handloaders who expect consistency from every case. Made by Peterson Cartridge, this brass is manufactured on small-batch production lines with quality control checked at every stage, from the mill to your reloading bench. Precision case-forming and wall-thickness consistency reduce runout and improve neck tension uniformity, which translates directly into tighter groups at the range. It is built for .300 RUM handloaders chasing the accuracy and repeatability that factory brass often cannot match.

Key Specifications

• Packed 50 cases per box, giving you enough cases to load a full session or start building a dedicated batch.
• Manufactured to match-grade tolerances on small-batch production lines for consistent wall thickness and case-to-case uniformity.
• Sold as unprimed brass, so you control primer selection and seating depth from the very first firing.
• Ships with a 2.7 lb. shipping weight, reflecting the full case count in the box.
• Backed by Peterson’s in-house quality control department, which inspects cases before they leave the production line.

Frequently Asked Questions

Is this brass primed? No, this is unprimed brass, so you will need to seat your own primers before loading.

Why choose match-grade brass over factory cases? Match-grade brass holds tighter wall-thickness and dimensional tolerances than typical factory cases, which improves neck tension consistency and shot-to-shot accuracy.

Buy the Peterson Unprimed Rifle Brass – .300 RUM, 50/ct

Give your handloads the consistent foundation they deserve with brass built to match-grade standards from the first firing. Browse our full reloading brass selection to round out your bench. Order it from our Lubbock, Texas gun shop for fast, insured shipping.