The cartridges mentioned are all fine rounds. I own a XC and a Dasher. Both are made with quality
components. As long as a human being is involved I'd be real hesitant to claim one is "more accurate" than the other. There's no 'free lunch' with either. Fire form one, a bit shorter barrel life with the other (I solved this problem of shortened barrel life by having the barrels on rifles I build for myself Melonite/Blk. Nitrided). The XC feeds immediately and without a 'hitch' from any magazine designed for the .308, that I've tried. Including the factory Rem., H-S Precision, and ACI. I can't say that about the Dasher. It took some thinkin' and experimenting to make it feed reliably from ACI mags. For F Class, ACTC or varmint hunting, if I was building for myself, I choose the XC or the 6 x 47mm L. because of the ease of feeding factor. If it was a single shot bench rifle I'd probably go with the Dasher. No one
rifle/cartridge combination should be expected to "do it all"! I hear that alot, these days,,,,,, "want a rifle I can shoot bench rest, varmint hunt with, shoot F class matches with, and take deer and antelope hunting
". Those words usually flow from someone with very little shooting experience.