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Rainbow Demon, 190's from a .308 case can easily leave a 24" barrel near 2600 fps at a normal, safe max average peak pressure. They'll stay well above the speed of sound through 1000 yards. Such loads from 1:11 twist bolt gun and 1:12 twist military M1 barrels were the match winners and record setters when the .308 was popular for standard USA NRA high power rifle competition.
And 250's were leaving .308's from a 1:8 twist barrel at 2150 fps with safe max loads bucked the wind better than any lighter bullet.
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