This would only plunk in a HOT barrel, only sometimes. I did 1.2″ OAL, R-P brass, Rem 2.1/2 Primer, 5.7gr TrueBlue. Western Powders Load Data says, Fed 150 primer, REM case, 5″ barrel, 1.2″ OAL, True Blue Powder: 5.7gr 731 fps, 6.7 839 fps and 20,889 PSI. It’s very visible with the right lighting conditions when shot. I measured the OAL of the bullet as: 0.6140 to 0.6125. Deeper than I had load data for, and that made me very nervous about pressure. 👎 To chamber reliably it had to be seated very deep. Hornady +P brass, Rem 2.1/2 primerĢ50 grain Berry’s Bullets. Plus, many 45AR loads I’ve seen floating around are actually higher pressure than 45ACP, because they’re intended for modern revolvers, which have more fully-supported “chambers” than any autoloader. Even though the Auto Rim has a lower maximum pressure than 45ACP, it has more internal capacity. In 45 ACP, the start load chronographed 100fps faster than indicated! Turns out 45AR isn’t as interchangeable with 45ACP as I’d thought. It says: Test gun 6.5″ barreled S&W Model 25-2, Remington 45 Auto Rim cases, CCI300 primers, 1.24″ OAL I used Speer #14 data for 45 Auto Rim and their 250 grain LSWC (#4684). You can stamp patterns into the nose of the bullet, which is fun. This bullet has a worse BC (0.117 nominal) than standard ball, but it leaves big clean holes in paper and feeds OK so far. Start ChargeĢ50 grain LSWC ( Speer #4684, 0.678″ length) Lyman Cast Bullet Handbook 3rd edition (obsolete) has data for this slug in 45 Auto Rim ( not 45 ACP, see experience with Speer data below) at 1.2″ OAL. The recoil-spring was enough to close the slide anyway in a pistol where it didn’t plunk.
A dummy would plunk in some chambers and a case gauges, but headspace on the on driving band in others. Seated with the top of the case-mouth just under the top of the cannelure, I measured an OAL of 1.2175″, and approximatly 0.9920″ from base to top of driving band. Different alloys mean different weights, usually it seems to cast a bit lighter from what I’ve read online. I weighed 5, and they ranged from 249 to 251.4 grains. Lyman #452423 “Short Nose Keith Semiwadcutter” from Matt’s Bullets (Lyman #452423 mold, 0.6545″ length) I was very surprised that performance was nearly identical in the different barrel lengths. I did: new HYPR brass, Rem 2.1/2 primer, Sierra #8820 240gr JHC at 1.185″ OAL. And I don’t totally trust that it will expand at 45 ACP speeds. It’s less than 5% heavier than standard ball, but has a 20% worse BC (Sierra says the G1 BC is. It’s an accurate bullet, and their data goes up to 900fps. Sierra 5th Edition has loads for their 240 grain JHC (#8820) SportsMaster bullet.
I like the idea of doubling-down on what makes the caliber special: big and slow slugs, in a 1911 pistol. I’ve always been fascinated with heavy bullets in 45 ACP.
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