I would think you will be even safer than with plastic. Pretty sure you will be 100% fine using 2 1/2" data ,the powder charge levels are pretty much of muchness between the two length shells,one has larger payload. TRY loading powder,wad then see if can fit 1/2 or 3/4 Oz of shot in remaining case space...if can fit 3/4 Oz treat as a 3" shell and load accordingly.
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