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I should probably expect to be corrected for this, so if someone can do better, please do.
The sonic crack is of course the bullet breaking the sound barrier. We all know that. But the sound barrier changes. Both humidity and altitude effect it greatly. If we both fire a round at 1050, but your at sea level and Im in the Blue Ridge Mountains, your bullet will break the sound barrier and mine will most likely not. Not if we do it again, but increase the humidity in the mountains to say 90%, then I will mostly likey break the barrier. So even though your loads are close to the 1050fps mark, you may need to slow it down some since you live in a lower altitude with more humidity. I usually aim for 950 to 1025. But I can get away with close to 1050fps mainly because I live 2700ft above sea level.
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