If you see any change in dimension on those 2 points you measured you don't want to go any further and it's strongly suggested to back it down. Fire it and allow it to come down to near the temp you measured it at.
You'll actually be measuring the case in front of the rim.
Take a piece of brass and mark 2 points 180°across the case head (mark on the headstamp). RB288, You can determine maximum pressure for yourself if you have a mic' that can read to the. I understand the barrel length differences, and extrapolating the velocities in would fall in at about 25 to 30 fps per inch which is about right.Īccuracy was good for the sbr at 25 yards a solid 1 inch group.Īnyway, just wondering about pushing to boundaries for the sbr a bit.īTW, there were no signs of any excessive pressure on any of the brass.Īlso, they were shot through a SpecWar 7.62 suppressor.Īny thoughts would be greatly appreciated. Now all these loads are at the max end of the "recommended" levels.Ĭan I push those upper limits to try to get the sbr to about 1050, or am I tempting fate too much? The main issue is that the same loads out of my 8.25" sbr average around 850 for the CFEBLK and about 920 for the H110.
300 BLACKOUT SUBSONIC LOAD DATA 208 MANUALS
These are all, substantially above what the manuals list. Out of my 16" ar, I was getting from 1125 to 1175 as my averages for the CFEBLK loads and around 110 to 1150 on the H110 loads. I was loading some 220 gr subsonic loads for my 330blk.
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