Military/Commercial Converted 300 BLK FREE SHIPPING!


Free Shipping via USPS Priority Mail

SKU: N/A Category:


Sold in 250/500/1,000 counts

All brass has been through the following process.


Sized-Sheridan Engineering Gauge

Trimmed-1.355 + or – .003/.005


Wet Cleaned

Corn Cob Media Polished

2% extra included to cover possible damaged or unusable cases.

WARNING: .300 BLACKOUT will chamber & fire in a 5.56/.223 rifle & can cause serious injury or death. Please be extremely cautious & keep ammunition separated & correctly labeled. M&S Armament LLC. isn’t responsible for any damage or injury from mishandling of this product.  

Note: Even though brass has been checked & qualified we always suggest inspecting brass & loaded ammunition before use.

When loading flat base bullets we suggest a light chamfer on inside of brass mouth or using a neck expander die.

Additional information


250, 500, 1,000