I don't think any 12ga Parker had 2 1/2" chambers. But you should be able to use the data for 2 3/4" shells. You'll just need fiber wads or a plastic wad with a shorter cushion area so you'll get the proper stack height. I use just Claybuster wads and would sub in a wad for 1 3/8 of shot and just load 7/8 or 1oz of shot - I forget now. If you're gonna sub in the same manufactures wad with the same base you won't be changing anything as far as pressure goes, or very, very little. I called CBers once and ask them the question. He said I'd be just fine. He couldn't give me an official answer without testing but said he wouldn't be afraid to do it.
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Paul Harm
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