#4 buckshot would be ok #4 bird shot is for pheasants. People make a big deal about energy transfer. An oz of lead at 1200fps is going to hurt but if it does not penetrate it is not going to knock you down and it is not going to stop you. Penetration is the key so the bigger the shot the better.
00 buckshot is over 8mm
#4 buckshot is 6mm ish
#4 bird shot is 3mm ish
Pretty big differences.
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