I have a pair of "Lil Skeeters" 10-12. I use them all the time with 12 bore target loads, homegrown, in my Lefever 10. They are a little slow in that that they have to removed and the 12 cases poked out, but I aint in much of a hurry anymore. I did shoot a couple of 3" Hevishot loads through a Zabala 10 I had for a short time. Had to beat the emptys out with a hammer and socket over a vise. That was too slow, even for me...