Forster released a new giant version of the Co-Ax at Shotshow, may be avail for pre-orders now at Hirsch or X-reload, it will handle up to 50BMG. Vid on Unltimate Reloader about it. THe B3 won't handle a 450-400NE 3" rim, I knew that 10-11 yrs ago when I bought mine, it also has a rim thickness limit on the jaws. For 90-95% of the shooters out there, it'll do what needs doing. Still doesn't hurt to have an O-frame around for things that are nicer to do on those than the Co-Ax, ie; bullet pulling, I have an RCBS puller, I can either buy a Forster puller, cut the handle on the RCBS down, or just use the other press.