Thread: 300blk Loading Tips

Originally Posted by Pommy

You probably won't get the stumpy little 110's and 125's 0.020 off the rifling with any amount of bullet left in the neck. Just go with whatever length the manual suggests for your particular bullets. Seat out further if you want - you're just sacrificing neck tension - the bullets are all jump tolerant so no point messing around much with seating depth really.

Start high and work down with subs. No risk of overpressure with such light charges (even at "max") but there is a risk of a stuck bullet if starting too low.

If there's a cannelure, there's your seating depth sorted. Seat to it and crimp. Treat 300blk like a 357 or 44 Mag in the sense that a magnum primer and a crimp is necessary to get good ignition.

You'll probably end up with some bullet munting levels of compressed loads with 2205. Lil Gun or H110 are denser and tend to avoid that.

Other than that... It is just a bottleneck centrefire rifle cartridge so follow the same SOP as you would for the others.

Are you saying the H110 will be better for supers?
My initial plan is to shoot 90% subs for just general target shooting and work up a super load when/if I want to do any hunting.