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The .45 Auto Rim was born out of necessity back in 1920, created so surplus M1917 revolvers could be fed without fiddling with half-moon clips. Starline carries that tradition forward with clean, unprimed brass that gives handloaders a solid foundation to build on. The headline feature is the rim itself. It runs thicker than a standard .45 ACP rim, which is exactly what lets these cases headspace and extract properly in revolvers set up for the .45 Auto and moon clip combination, no clips required.
Starline builds this brass to the same dimensional standards as their well-regarded .45 Colt cases, and that consistency shows up on the loading bench. Uniform case walls and tight tolerances mean your powder charges behave predictably and your crimp stays even from one round to the next. These cases run at moderate revolver pressures, so they hold up well to repeated reloading when you keep your loads sensible. The .45 Auto Rim uses a large pistol primer, and these arrive unprimed and ready for your prep routine.
This is a straightforward case to work with. Standard .45 Auto Rim dies handle it without any special setup, and the straight-walled rimmed design makes sizing, belling, and seating about as simple as revolver reloading gets. It's a favorite for folks shooting the S&W Model 625, old M1917 wheelguns, and other revolvers built around the .45 Auto platform who'd rather skip the moon clips entirely.
One thing worth flagging up front: this case will not function in single action revolvers chambered for .45 Auto, such as a Ruger Blackhawk running a .45 Auto cylinder. If you're feeding a double action .45 revolver and want a cleaner reloading experience, this is the brass to reach for. Each bag holds 50 fresh cases ready for your bench.
No, and that's the whole point of the .45 Auto Rim case. The extra-thick rim lets it headspace and extract on its own in revolvers designed for the .45 Auto and moon clip combination. You get to leave the clips in the drawer and load your rounds straight into the cylinder.
The .45 Auto Rim uses a large pistol primer. These cases ship unprimed, so you'll prime them yourself as part of your loading process. Standard large pistol primers from the usual makers are all you need.
No. This case will not function in single action revolvers chambered for .45 Auto, including a Ruger Blackhawk running a .45 Auto cylinder. The .45 Auto Rim is meant for double action revolvers built around the .45 Auto and moon clip setup, like the M1917 and S&W Model 625.
You'll want dies made specifically for the .45 Auto Rim rather than straight .45 ACP dies. The rimmed case has different dimensions at the head, so Auto Rim dies give you proper sizing and crimp. Once you're set up, it loads about as easily as any straight-walled revolver case.
| UPC | 810742026141 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 45RIMEUP50 |
| Caliber/Gauge | 45 Auto Rim |
| Length | 0.889"-0.894" |
| Product Type | HANDGUN |
| Quantity | 50 Per Bag |
| Style | Large |
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