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H4895 is temperature sensitive, in my experience. I noticed major accuracy changes in my batch, tossing 77 and 80gr .223s through my AR-15. On a cool day, it would hammer. Warm up and I noticed a drop off in X-count.
It is not nearly as tempermental as say, Winchester 748 ball powder, but it is less stable than Varget, IMO. I've left Varget in a car trunk for 8 hours before shooting it in the evening (accidently, I assure you) and noticed no difference in on target performance at practice. X-count was right where it normally is.
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NRA Master, Highpower Rifle, Across-the-Course
NRA Expert, Highpower Rifle, Mid-Range Prone
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