Where do you even find 3 1/2" slugs? Or do you load your own? I had a rifled barrel for my 11-87 super mag last year so I figured the slugs were at least available, but never did find any for sale. Might be "interesting" to try a couple in my 870-I do know that 3 1/2" 00 buckshot gets punishing after about 3 rounds though.