Quoted:
I had an exhaustive discussion with a few knowledgable guys here when I was recently asking the same question and found that 16" is PLENTY to shoot out to 800 yards. They had solid numbers and data to back up their claims- not just hearsay. If I can find the thread, I will bump it.
Roger That... BUTT!!!
I'd go 6.8 for 16" and a can.
Stewart Wilson is a freak, a kewl freak but still a freak:
http://www.reloadersnest.com/forum/topic.asp?TOPIC_ID=11579
He was telling ARMALITE about "over gassing" before anyone was talking about it.
Again, I say 6.8 Silver State Armory 115gr Tactical Load with a can... and 16" barrel.
7.62/.308? 18" or MOAR FTW.
6.8 or don't be late for 16" or less.
EDIT: I'm not exhausted or tired.
I'd go 6.5 CM or 6mm CM (GAP) before I went through all that horseshit... in a .308 gas gun...
AND HUMP THE THE EXTRA 8"-10" OF BARREl.
That's 24"-26" of pipe for those in Rio Linda.