I chamber sleeved a 16 sterlingworth from 16 to 20. Two paper shells left in the chambers for 50 years had altered them to Swiss cheese. On a whim I put a couple 16/20 chamber adapters in it and shot a couple patterns. They were great. So I had the chambers reamed out and a set of custom made chamber adapters installed along with a reworked extractor for a 20 gauge. One of my kids still has it in his gun case. It worked well for pass shooting dove, Sporting Clays and crows of opportunity.