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Mate, you forgot the obvious choice, which is to have a 1:8 308 and a 1:12 308! :thumbsup:

I found the velocity difference between my 16.5" 1:8 and 23.5" 1:12 was a lot less than I expected,...

Sight in with your hunting ammo, but you can practice with anything. Just be aware the point of impact may be different, but don't worry about that, you should focus more on group size, which...