mathman,
Oh, I'm not worried about you--or me. I regularly exceed .250 book loads.
The latest version of Accurate 2495 is also a real good one in the .250. It's now being made specifically for Western Powders and is real good stuff. In a recent test of a Ruger 77 .250 it was more accurate than a half-dozen other powders in that burning range, including Varget and RL-15. Not by much, but it beat 'em.