May 21, 2019, 15:42
Rim Rock has really done shooters of the .45 Super and Rowland a favor with these heavy .451” bullets. In working up loads for my .45 Super I experimented with four different brands of .45-cal RNFPs and SWCs, and the Rim Rock 250-grain RNFP came out the winner for my go-to bear load. The shape of some of the other .452” projectiles originally intended for the .45 Long Colt required seating the bullet too deep for minimum COAL before they would fully chamber reliably in my Super-modified R-1 1911 but I had no such problems with the Rim Rock .451” ACP bullets.
Our bad winter left us with huge berms of plowed snow pushed up along the edge of the driveway, which I used as backstops for some of my testing. Granted, large mounds of packed snow and ice that had been through multiple freeze-and-thaw cycles are hardly a consistent or scientific test medium, but out of curiosity I dissected a couple snow banks with a spade to recover the bullets. Loaded to 1,110 feet per second, I dug out the first the Rim Rock 250-grain RNFP at a depth of 46 inches and some had penetrated in excess of six feet. For comparison, I also shot six Speer 240-grain JSPs loaded to 1,180 fps from my 4-inch .44 Magnum. I recovered all six and was surprised to find the first .44 bullets at 24, 26, and 28 inches and the deepest .44 Mag penetration was the same as the shallowest Rim Rock RNFP, 46 inches.
The Rim Rock bullets are definitely hard cast, the recovered slugs retaining 100% mass, clearly showing the rifling marks from the barrel, and not deformed at all. I wanted a heavy hard cast bullet with good penetration for the Super. Looks like I found a winner and will be ordering another box or two.