Figure out the max distance inside your home, that you'd be likely to fire, then take a shot with that birdshot (outside) at a 1"x12" board the same distance away - and you'll have your answer.
That's how I got mine - a field load of #6's punched a fist-sized hole through a barnboard 12 FEET away.
Just my $0.02, but no BG's going anywhere but O.U.T., with a hole like that in his middle..................................
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