308 cal is a slug shooter exclusively. I thought the OP meant pellet shooters. The Hercules will shoot both pellets and slugs.
Either one, but my main interest is lighter slugs to get the flattest trajectory in the intended range. I'd rather shoot a 60 grain at 1250 and dump all the energy into the target rather than a 100 grain at 950 that will go straight through most lighter game.
That assumption is probably only good to about 50yd on energy retention, trajectory, etc. If even shooting to 100yd, youve lost about 50% energy with your 60gr @1250 vs only 25% or so loss with your 100gr @950fps.
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