I have the opportunity to have my Remington 700 22-250 accurized or convert it to either a 6mmBR or 6.5x47 Lupua for about the same cost (~$1100). The conversions would have a match grade barrel, timney trigger, Boyds stock bedded, action blue printed and a muzzle brake installed. The gun would be used for coyote and praraire dog hunting as well as target shooting. I've been told by the gunsmith that the 22-250 is good out to 400 yards, the 6mmBR is good to 650 yards and the 6.5x47 is good to 1000 yards. Which do you think I should go for??? Thanks.