I have the gaep trimmer in 12, 20,28 and 410. It has the different shanks that screw on to the cutter for each gauge. I was reloading some Winchester AA in 410 and noticed the 410 shank was to large and flared out the end of the shell making it useless. Emailed Charles at gaep, 10 min later got an email from him, saying no problem he would make a shank to fit the Winchester hulls. The original shank works on other 410 hulls, so obviously the Winchester ID is just a little smaller. So if anyone is ordering one and plan to trim WinchesterAA then make sure you let Charles know in advance.