Re: 7mm rem mag to 300 RUM
Detachable mags look cool, but aren't really aren't viable on the RUM, especially if you are handloading VLD's and the like. The COAL is going to be too long to accomodate any aftermarket system even if a smith could open up the stock/box/action.
For target shooting, one at a time is good. For hunting, good bullet and good shot placement, will diminish the need for a follow up. The round hits like a hammer.
Mine is a 28" Krieger 1-11 twist #7Hvy Varmint. It shoots very will with 190VLD's. 2" 3shot group at 500yds