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Generally a dumb idea. You lose a lot of velocity and make a huge fireball. If you want a bullet that size and in a short package go with .300BLK...
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There’s a past thread on this subject
At 300 yards a 12.5 inch .308 has more velocity and energy then a .300 blackout at 100 yards in a 16 inch barrel
300 blackout shines suppressed but that’s about it vs a .308
.308 is very forgiving with barrel length
There’s lots of info on this subject if you research or you can grab a chrono and check it yourself
I just built a 12.5 inch .308 for this exact reason
This is bad information from someone who is into the boutique cartridges and yes I own both in multiple barrel lengths
If your doing a pistol build I recommend the SOB brace if photo bucket was working I would post pics of my build