Not sure why you got those results @Tahr as the bullets you listed there are generally quick opening bullets, maybe it's more to do with the speed as they have modest velocity in the heavier weight bullets. In saying that the 7mm/08 and 308 aren't what I would call fast either.
It could be something to do with the good penetrating qualities of the 6.5 projectile. Haven't shot anything past 80 odd yards with mine yet so can't really comment on that one.
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