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Years ago I used IMR3031 with my 45-70. It went BOOM in the cold morning and BOOM in the warm afternoon. 3031 was showing almost 100fps velocity difference over temp, according to my Chrony - which didn't matter for 100yd shots but was audibly noticeable. Later I switched to H4198, part of the "extreme series". Now it goes BANG morning, noon, night, summer and winter.
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