RE: Minimum acceptable for 300lbs @ 300 Yards
Minimum caliber would be a 6mm/.243"...however, I think the question meant to ask what the minimum CARTRIDGE should be.
Typically, the .243winchester would be the minimum cartridge acceptable for this type of game....taking in account that in MANY states whitetail or mule deer can meet this specifications. However, if you're talking about a game species that AVERAGES 300# for an adult, you're going to need to step up to a bigger cartridge, I'd put the limit at the .25-06 or .260Rem.
However, if these specs are to be literally met as the MAXIMUM demand for this cartridge, the .243win is perfectly capable, and sets a fine dividing line.
If we're talking about bruins or elk that are almost always 300#, then a step up in power is necessary.
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