Sig Sauer Unprimed Rifle Brass Cartridge Cases for .300 Blackout (Sig Sauer part no. BR2029) give handloaders a clean starting point for building consistent ammunition in this popular AR-platform cartridge. Sig Sauer manufactures these cases for consistent weight, concentricity, and overall uniformity, which are the fundamentals that let a reloader work up a repeatable load rather than fight case-to-case variation. Each box holds 50 unprimed cases ready for priming, charging, and bullet seating on your own press.

Key Specifications

• Sized specifically for the .300 Blackout cartridge.
• Unprimed rifle brass, ready for the reloader’s own primer, powder, and bullet.
• Manufactured for consistent weight and concentricity, supporting more uniform charge-to-charge performance.
• Packaged 50 cases per box, a practical quantity for building up a working batch of .300 Blackout brass.

Frequently Asked Questions

Are these cases primed? No, this is unprimed brass; you’ll need to prime it as part of your normal reloading sequence.

Why does case uniformity matter for handloading? Consistent case weight and concentricity help produce more uniform case volume and bullet alignment, which translates into more consistent velocities and accuracy from load to load.

Buy Sig Sauer Unprimed Rifle Brass for .300 BLK

Start your next batch of .300 Blackout handloads with brass built for consistency from the first firing. See more from Sig Sauer in our reloading brass selection. Order it from our Lubbock, Texas gun shop for fast, reliable shipping.