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Have not seen recent discussion of A303 Barrel Gas Port modifications. This is for anybody out there considering drilling out the gas ports of a 3" chamber barrel for the use of 2 3/4" shells. This is my very recent experience dove hunting with A303 12ga. Started with a 2 3/4" chamber barrel installed. After about an hour, had a good baseline of flawless operation and how far empty hull are thrown. Switched to a 30" barrel with 3" chamber and unaltered gas ports. Remainder of the morning saw flawless operation with empty hulls thrown same distance.

Used RIO and Monarch 2 3/4" shells, 1 1/8 oz, 1350 fps. My experience confirmed internet info saying 2 3/4" shells rated 1300 fps or above would work fine in an unaltered 3" barrel. Your mileage may vary. Happy shooting.
 
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