Got out today... first time in months thanks to the birth of my son (not crotchety about it). Bit rusty, took the AT out configured in 20" 308 gentleman (suppressed). Also took my Xm3 and Sako TRG22a1 to decide their fate (Commodus gave them a thumbs down).
Anyway something I was able to do is compare 308 barrel lengths to the same velocity. Unfortunately it's 3 different barrel brands and 3 different chambers. Still, interesting results.
Barrels were 18.5", 20" and 26", excuse my shooting....its embarrassing.
30-50fps faster in an 18.5" compared to the 20". Both were suppressed (18.5 w/ fa762ss, 20" with omega 300). The 18.5" has a tighter match chamber compared to whatever AI puts in their barrels and round count is close enough to not matter.
Another thing that's interesting is the left and middle are same brass, bullet, powder, charge weight and the only difference is the primer. CCI standard in the "old m118lr" and Ginex in the "new m118lr". Speed is better as well as es/SD. I had thought Ginex was the generic name of CCI but I'm second guessing that info.
Anyway something I was able to do is compare 308 barrel lengths to the same velocity. Unfortunately it's 3 different barrel brands and 3 different chambers. Still, interesting results.
Barrels were 18.5", 20" and 26", excuse my shooting....its embarrassing.
30-50fps faster in an 18.5" compared to the 20". Both were suppressed (18.5 w/ fa762ss, 20" with omega 300). The 18.5" has a tighter match chamber compared to whatever AI puts in their barrels and round count is close enough to not matter.
Another thing that's interesting is the left and middle are same brass, bullet, powder, charge weight and the only difference is the primer. CCI standard in the "old m118lr" and Ginex in the "new m118lr". Speed is better as well as es/SD. I had thought Ginex was the generic name of CCI but I'm second guessing that info.
with an ES of 90! But it had one round that read 77 FPS high, so I loaded my last 8 and shot the group on the left. Look at that badass ES and SD.
