A 308 with a long barrel makes a great sub gun
The extra case capacity seems less of an issue than I led myself to believe regarding subs and suppressor volume
You definitely don't need it but it doesn't seem to make a sound difference compared to 300blk if the barrel is long
Bullet speed seems to be the real difference, from 850fps to 1000fps with the same bullet the noise increases heaps
I slowed my 308 load down a little and it was mouse fart quiet
Im tempted to get some cast bullets in 6mm to try in the 243 as a pointless excersize that are around 80gr as I don't "need" the full power of the 30cal 151gr or 190gr sub-x to do what I do as I used my 10-22 for years to good effect
And shooting hares while hunting is fun too when it's quiet
I think use what you've got
the minor differences in bore size don't count for much.
7.62mm vs 10.9mm doesn't mean much if you are just poking a hole in muscle
Get close and crack their skull and it's game over.
Too low is jaw and sinus cavity
Too high is forehead meat
Neither kills the animal so it's worth looking at a diagram
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