weighing brass is in the catagory of sitting on the front porch killing ants with a claw hammer. It's fun and fills your time, but not much of anything of quality is accomplished.
In my 23" hart barrel 223 AI with a 14 twist, I am shooting the 50's at 3750-3800 with N-133, 7 1/2 primers.
Same barrel shoots the 55g Sierra blitz at 3600-3650 fps.
Benchmark is slower by 100-150 fps...can't recall exactly.
H335 shoots very tiny groups, but have not checked the speed.
My 27" barrel is 100 fps faster than the 23" barrel, almost exactly with the same powder charges.
My chamber is cut with a minimum spec match reamer with a .2245 throat and zero freebore.
I have a load with N133 shooting the 40's at 4200 fps.
I use IMI brass that is tough as an anvil.
Last edited by keith; 09/01/09.
