For suppressed use, I'd go as short as you can without giving up the effectiveness of the cartridge. A 20" or 22" 308 would be fine and not give up much velocity. I wouldn't go shorter than 18" though.
Last edited by wareagle700; 09/21/16.
John 8:12 "I am the light of the world. Whoever follows me will never walk in darkness, but will have the light of life."
