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.25 Flashpup slug vs pellets.

Tried the same hybrids in mine. Got pretty much the same results you did...lol. It may well shoot others better, I just never tried anything else. The JSB 25.39gr's shoot excellent in my synthetic side lever so I went back to them and never looked back.

Random thought would be try a few other brands/weights and see what kind of results you get?

Hopefully someone else who owns one will chime in with a slug or slugs that worked well in theirs.