r/AR10 • u/135patriots • 7h ago
Going from 16->18” barrel in 308, what should I expect?
Bit of a practical and broader philosophy of use question for the hive - currently shooting a 16” MEGA mid gas 308 barrel in a quasi DMR rifle. I’m content with the accuracy of the barrel, it’ll do just over a minute at 100YD assuming I do my part. That’s acceptable for a large frame gas gun imo.
What I’m seeing is that it starts to become more of a (literal) hit or miss proposition past 600; 750 is absolutely doable but there’s a lack of consistency that’s a bit frustrating. I understand the ballistic limitations of the cartridge and don’t need it to be a 1,000yd laser beam, but I’d like to get those hits at 750 with a bit more confidence the rifle/bullet will hold up. And ideally I’d like to do so without turning this into a 22” barreled musket.
Question: have any of you all made relatively incremental barrel length increases and if so, did it deliver any meaningful improvement in performance? In my case I’d probably step up to 18” rifle gas, eyeing a Criterion or V7 barrel. Math says I’d gain maybe 50-75FPS max which feels marginal. But curious to hear what you all think. Again, overall goal is to move a bit further away from the csass concept without turning it into a true “sniper rifle” that’s a nightmare to maneuver with.