What length barrel on the .250? I have owned a bunch of .250s, including a custom bolt rifle, and never been able to break 3000 fps with 100-grain bullets no matter what powder I tried, from a typical 22-24" barrel.
Started trying 4451 in the .257 when the powder first appeared, due to a shortage of H4350 (and even IMR4350) at the time. Turned out the two manufacturing lots I got were somewhat different, which isn't unusual in new powders, but with 46.0 grains they got 3052 and 3104 with the 100-grain Ballistic Tip seated a little off the lands in my somewhat worn Remington 722--wit ZERO signs of excessive pressure.
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