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Weight?? I'd think API has the most use. Not understanding how weight entered the equation.
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Well if you want it dead accurate, which using an M82 kinda defeats that purpose, you use the weight of the bullet you plan to be accurate with. If your looking for broad side of barn for a zero then any of them would work but the API would be the most "equivalent" to M33 if you got a bunch to use at the range. All my special rounds would be saved for a time of need.
I can only use non-magnetic BMG rounds at my range, otherwise we eat up the steel targets of which it is mandatory to use. You can put a paper target in front of it but the round has to be stopped on steel. I only know of one ammo maker and that is the Hornady AMAX 750gr. I believe there were two others but this was the cheapest and even this is not cheap.