Re: 338 Matchkings vs Gamekings
I have a factory .338 RUM LSS. Factory standard 26" light weight barrel. After some heavy teething pains I've got it shooting pretty good. 250 grain Sierra Gamekings are the best so far, but haven't tried MK's. They're up on my list.
250 grain Sierra Gameking, 83.2 grains IMR4831, CCI 250 primer, 2859 fps, 9/16" 5-shot group at 100 yards. Using the same load but substituting 87.3 grains of WC852(s)I get 2925 fps and a 3/4" group. Max load appears to be 93 grains of WC852(s) pushing it along at 3077 fps.
Been disappointed with Accubonds, as I couldn't get any better than a 1" group at 3054 fps using 91.4 grains of WC852(s). Still suitable for elk though.
With a longer and heavier barrel a .338 RUM should do quite well.
Mark in Utah