300 Blackout - 135gr Sierra Varminter
This video details a reloading and range test of 135gr Sierra Varminter bullets in .300 Blackout. The host explores IMR 4227 and Winchester 296 powders, encountering significant pressure signs with Win 296 and cycling issues with IMR 4227. Bullet setback due to insufficient neck tension was identified as a major accuracy impediment.









