Running 00 buckshot thru that choke will be fine safety wise. It is not good accuracy wise. Buckshot is finicky at the best of times. The pellets are being distorted more than they already are thru a full or extra full choke. Leads to flyers and random holy patterns at 20-25m. Having fired a few in my time I would suggest you use a modified choke. Almost consistent patterns and way more accurate.
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