Originally Posted by
Travis Warren
300 BLK can be a challenging round to reload. Being such a versatile cartridge, with options from 110gr to 240gr projectiles, dozens of powder options, sub vs Sonic velocities, and consideration of weapon platform, the BLK can drive you nuts. As one post suggests, the operation of the magazine can be a factor in your seating depth. I tend to run C.O.A.L short with the BLK to accommodate the ogive vs feeding lips of the follower. Because of this I ensure the powder I'm using can be compressed if necessary. I also air to the side of caution by backing loads down and working up. Seating deeper means more pressure. Weight is a factor. Of course your barrel's twist rate much accommodate the bullet but beyond that I have found particular magazines' springs don't have enough strength to smoothly move the next round into battery to provide reliable feeding when fully loaded. Consider a standard Pmag. 30- 55gr FMJ's .223 Rem's have a total of 1650grs in projectile alone. 30- 200gr hpbt 300 BLK have 6000grs in projo alone. I have found that 20rds runs reliability with heavier subsonic loads. If you're running an AR platform I would suggest an adjustable gas block and even increased diameter of the gas journal in the barrel. Doing both allows you to run subsonic (suppressed or unsuppressed) reliability. And also hotter supersonic loads. Between the tweaks n tinkers on my 300BLK AR Pistol w/ 8.5" barrel and the various "specific job" loads I've developed for said pistol I would consider it my most involved caliber. Above even my 1000yrd .308 development which seems silly when I actually consider it. Best of luck, there are several people through Wes Sage's various social media outlets that are very knowledgeable about the 300 BLK.
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