300 BLK - Powder Coated Bullets With IMR-4227
This video details the testing of IMR 4227 powder for 300 Blackout reloads using powder-coated bullets. The instructor experienced issues with powder-coated bullets in previous tests and aimed to determine if IMR 4227 would function reliably. Two bullet weights were tested: 160-grain and 202-grain, with specific powder charges and overall lengths outlined. The testing involved both unsuppressed and suppressed firing, with observations on cycling, bolt lock-back, and accuracy.













