Hey, I have a remmington sps varmint in .308 and am having it cut and threaded for my AAC SD762 can. The factory bull barrel is 26" What is the shortest (I was thinking around 20") I could cut it with out any noticable velocity and accuracy loss? Any one do this and wish they cut it to a different legnth afterwards? Learn by mistakes. Whats your imput. I do load for it and would still like it acccurate out to at least 800m Right now its set up with a MK4 ELR with a milling ret.