I know that rimmed cartridges are generally accepted as most accurate in break open actions. Having that nice solid rim to headspace on should hake for better accuracy, but in practice, is there enough difference to measure? The accuracy of my .300 Savage S14 barrel no longer amazes me, as sub one inch groups have become common from it. With a five shot string, I often have two or three in one ragged hole, when using the bipod. I do neck size, but I couldn't swear that it makes much difference. So, I am wondering if some of those exotic rimmed wildcat chamberings are really worth the trouble?....DanM