work it backwards
how much energy do you require at that distance????
so you now know what weight projectile you will need if say starting out at 3000fps or 2700fps
that will narrow it down somewhat...
then what calibre and cartridge will deliver that
then what factory load can YOU ACTUALLY PURCHASE that meets that criteria
or just say.270 or .30/06 or 7mm mag or .308 or .280rem or just start a shite slinging match cause I can piss further than he can LOL
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