I've loaded many 2.5" shells. Just use the data for 2.75" shells and sub in the fiber wads. As Matt said, pressure will go down a bit. Years ago when load data was for fiber wads it was suggested to go down 10% if subbing in the new plastic wads. I bump it up a grain and have never had a problem. About 95% of my guns are Damascus barreled SxSs.
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Paul Harm
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