Googling minimum FPE needed for pellet expansion.

6gun said:

Those wad cutters were my go-to when they came in the plastic belt clip boxes. Heck just a wad cutter on its own moves a lot of fluid out of the way fired correctly.

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Out of nostalgia, I just looked up wadcutter pellets and found the RWS Hobby's. They look similar to the old Crosmans, but with a pleated skirt, like the old Benjamin High-Compression pellets. I might get a tin to tryout.