Just finnished reaming my 357 mag. to 357 max. tonight it was a hole lot easer than I thought,instructions say you can use a 3/8 socket which I did but the only socket that will fit it is a 8 point the 6 point socket will not fit.Now to take it to range tomorrow and see how she shoots,I got 180 xtp's and horn 180 sspb to test with. Thank's Tim the reamer will be heading your way tomorrow morn.