Thread: Trailboss, 151gr cast hollow points and 300blk

All the published load data is geared towards semis. "slow" powders like H110 and 2205 are good to use when you have an action to cycle with a gas port that needs a fair bit of gas volume and pressure. It's what CFE BLK is specifically designed for.

But you don't see sub loads with 150gr pills because they're too light to build up enough gas to cycle whilst also staying below the sound barrier (with any powder), so functioning sub loads start at like 190gr and upwards.

No action no problem though - shoot whatever bullet you like at sub speeds. Just bear in mind that if you use a slow powder (like published data would have you do) all it's doing is creating more pressure at the muzzle meaning more work for your suppressor. Going off-script and using faster powders will create much quieter loads.