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Jimro, your data on IMR8208 is interesting.
It's peak pressure with 45.3 grains under a 155's claimed to be 60,900 psi; that's a normal max load. Nothing over max at all.
It's velocity of 2854 won't cut the supersonic mustard past 900 yards. It's gotta leave at least 2950 fps and 3000 is better when in cooler weather at low elevations.
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