I just aquired another remington 700 sps buckmaster. List of parts coming are Shilen #7S 6mm 8 twist blank, badger recoil lug, CEG fluted bolt with M16 style pinned extractor, callaghan speed lock firing pin assembly, jewell hvr, Wyatts box, B&C A2 olive drab w/ web. Question is what caliber, want to be in the lands with a max length of 3.010" after some mag and reciever mods, I usually single feed, but decided I wanted to do a repeater in case I don't like it and want to sell it, also do not want to spend 500+ on comp or custom dies. it is a standard bolt face .473, I've been pondering 243ai, 6xc, 6mm dasher, 6x250 ai 40*, and I like the idea of a 6x25wssm but would have to switch bolts and find a reamer and die set. Any options, opinions, input much appreciated, to many choices. Oh and max of 3100 fps with 27" finish length and 105-107 grainers. Thanks.