Re: Remington 700 22-250 action
You shouldn't have to do anythign to the BF. You only have 3 main options for a factory BF:.384, .473 & .540". There are also the safari and big bores with the .585 BF. Everythin depends upon what you want to build. The standard short action for a .243/.308/.22-250 etc will allow you to build a myriad of standard and wild cat calibers. Both Kellano and HuntermanPaul have a .473 BF action, from the sounds of it. If I was going to build on those actions, it would be either a .260 or .308.
Just get in touch witha good smith and he will lead you through the process of building what you want.