I've seen velocities pretty easily and consistently 150 - 200 fps faster than the creedmoor which is what I would expect.
10% powder never adds 10% velocity.
Youve just got a fast creedmoor and a standard prc.
Same in all the step up calibers, 270 isn't offering huge speed over hot 7mm08 nor is the fuddy over hot 308. As usual you'll see the biggest gains in heavy for caliber bullets or longer barrels with the ability to squash a slower burning powder in.
Yeah the saum is faster but it's also a good 6% more case capacity, and was always to finicky in the feeding department to be a viable factory rifle option anyway.
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