I've read a little about cutting down .223 brass to make 300 BLK out of it. I tried a cheap chop saw for the initial trim, but the saw was so cheap it couldn't do a proper 90 degree cut. I'm OK with spending a little more to do it right. I have a Lee turret press that I've been using for precision rounds (may get something faster soon). What should I use to convert my .223 brass to 300 BLK?