Hey,you wouldnt happen to be in the military would you? ...Maybe just got off a deployment??? If so you might know me
Depends on what your doing with said build would d3pend on what of those 2 calibers Ide choose...ALSO, "how accurate" are they depends more on shooter assuming a "good" weapon has been built. Both of those calibers, given the proper platform, barrel, also ammunition (and other factors...i.e. rate-of-twist, grain weight, to name a few) should yield some amazing results at extended ranges.