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Tobra,
You don't have to go bigger, you just have to be more careful/precise and be prepared to pass up shots you're not very confident in making. My nieces and god daughter practiced with the rifle out to 300 yards and shot from basically static rested position over bait at known distances.
Having said that the favorites among those I associate with tend to favor AR pistols with 12” barrels and LPVOs. They most effective are three AR-10 based pistols shooting .358 Winchester. The AR-15 based pistols show a majority in 6.5 and 6.8 with a couple of the big bores.
No hard data but it appears the 6.8 has a slight advantage over the 6.5 out to 50-100 yards, roughly same effect 100-150 yards or so and then the 6. pulls ahead.
The big bores are effective but for the weight and recoil it seems the .358 Winchester is a better choice.
The .300 Black Out is effective but outside of suppressor use with sub-sonics has fallen out of favor. Even with good expanding subs I think one needs to pick your shots and use restraint.
S/F, FOG
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