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H4895 is fairly temperature "sensitive
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Yes I wondered about that, I have mostly used varget and 165GK in the past. I started with the H4895 and the 150 core locks just to use then up.
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I could see the barrel geting hot and expanding, there by generating less friction
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The bbl was hotter than I like, because of circumstances sunny, temp etc. It was never too hot to cary the rifle by the bbl (no I dont carry it that way), but hotter than I like. Bbl friction is a funny thing. More friction can increase mv becaus of increased pressuar and increasec powder speed . I dont know if there is a point that reducing friction could cause an increase of mv above normal or not.