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even if I could shoot at that distance, tagging a 6in by 6in block and getting it in at the right angle would be difficult at best.
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this was kind of my point. if you can't tag a 6x6" block at 500yds, when the bullet velocity is down to the level you are interested in, what is the point of being concerned with expansion or lack of same at that range /speed??
And, forget about reduced loads cycling any semi auto, unless you're willing to modify the gun specifically to do that. Very few guns, even ones with adjustable gas systems are adjustable enough to cover that range without some kind of modifications.