I load 2 7/8 and 2 5/8 10ga shells all the time for my old SXS's with spacers on my 600jr. A couple years back, with too much time on my hands, 2" 12ga were reloaded. Enough spacers and a spacer soldiered on the punch in the final crimp station did the trick. I use the same short kit [ and homemade spacers when necessary] for both the 10 and 12.