A good friend of mine was getting 2,650 fps with 150 grainers in an 18.5" barrelled Remington M-788. Interestingly enough, we chronographed the same ammo in another guy's 24" M-700 heavy barrel and got the same speed. ???
"Load from a Disk" software says over 2700fps is attainable in a 308Win with an 18.5" barrel. I ran some numbers using RL-15 and H380 powder and the pressures were running in the 52,000CUP area at that velocity. Remembering that all rifles are entities unto themselves, that may or may not be a problem. Work it up slowly, and listen to your rifle. They'll quite often let you know when they are getting warm.
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