If I can get these things to meet my parameters I think I’ll order another for use in the 20 gauge . Sorry to say they don’t make a Minnie design close enough for use in a 16 gauge . They do however make a roundball mold that would work in the 16 . I already have El Cheapo Lee roundball molds for use in the 10 , 12 and 20 so I just might try one of their roundball molds the correct size for my 16’s . And to answer the question before it’s asked , no I do not need these I already have slugs and most roundballs covered , but ......... what the heck