Don, if you reload 20's, many of us shoot 2 3/4" shells, but reload them with low pressure, mild velocity 3/4 and 7/8 oz loads at less than 1200 fps. For example a RST 20 is 2.550", a Win AA is 2.646"--that's less than a tenth of an inch difference. I shoot these loads in Damascus 20's and fluid steel.
1. Win AA or Rem 20, 3/4 oz load ,20/28 14.5 gr, Claybuster 1075--1200fps @7200psi
2. Win AA or Rem 20, 7/8 oz load, 20/28 15.5 gr, Claybuster 1078--1250 fps @7900psi
or if you have or make 2 1/2" cheddite hulls, ie, RST
3. Cheddite 2 1/2', 20/28 14.3 gr, Claybuster 1075, 3/4 oz load, 1200fps @7200 psi
4. Cheddite 2 1/2", Unique 16 gr, Claybuster 1078 or 1075, 7/8 oz, 1185fps @ 7200psi.
These are all very low pressure for 20 ga. I use Win 209 primers in all but would also sub Cheddite primers. I also hunt grouse and woodcock, even pheasant with these loads. Love the mild recoil when shooting clay targets.
Love to see pictures of your gun.
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"How kind it is that most of us will never know when we have fired our last shot"--Nash Buckingham
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