Ace I have used IMR 4064 in several 22-250 rifles over an almost 50 year period. It has been a go to powder many times. The favorite load had been 36.0 gr. and 50 to 55 gr. Sierra bullets, but the last one I have worked with really did not like that much and I was getting high pressure signs. It seems to like 34.7 a lot better and it was accurate. I do not know if they have changed 4964 or it is the difference in guns but I have used the bigger load in many guns and no trouble after working up to it. The one barrel I have just changed out just last year with over 10,000 rounds on it. it was a Douglas barrel.
Be safe and work up all powder loads. Gordon
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