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FWIW the BC of a 75 gr A-Max is 0.435 and 80 gr A-Max is 0.453, a little higher than the range 0.2 - 0.36

A heavy barrelled 223 with heavy projectiles can foot it with a 308 out to 900 or 1000 yards for target shooting.
Our Savage 223 described above shoots accurately out to 900 yards, can do 1000 if...

What type of shooting are you intending to do?
A 75 gr A-Max would be a pretty heavy pill for a short barrel.

Hornady's "Handbook of Cartridge Reloading" recommends a 1:8 twist barrel for the 75...