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45 Auto Rim Ammo

Power, Precision, and Performance.

At Steinel Ammunition Co., we provide premium and high-performance ammunition for shooters who demand reliability and precision. If you’re in the market for .45 Auto Rim ammo, you’ve come to the right place. Whether you’re loading your modern revolver or an old Webley, Steinel Ammo ensures that every shot counts.

We’re talking enjoying your favorite revolvers at safe pressures: energy transfer that gets the job done decisively, without the Hollywood knockback nonsense. Built in the US for collectors and shooters like you, who cherish vintage platforms but demand reliability. Our .45 Auto Rim revolver ammo keeps history shooting strong.

  • Four Steinel .45 Auto Rim Low Pressure 185gr SWC cartridges lined up to display semi-wadcutter bullets and brass cases
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    45 Auto Rim Low Pressure 185gr SWC

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Why choose Steinel .45 Auto Rim Ammo?

The .45 Auto Rim is a versatile, time-tested cartridge that combines power with performance. Developed in the 1920s to offer an alternative to the .45 ACP, the .45 Auto Rim is unique because it can be used in revolvers that were originally chambered for .45 ACP pistols, without the need for moon clips.

What sets our .45 Auto Rim ammo apart from others? It’s built for shooters who expect nothing less than exceptional terminal effectiveness, accuracy, and dependability. At Steinel Ammunition, every cartridge is carefully crafted to deliver real terminal effectiveness, ensuring that your revolver is loaded with the best for hunting, defense, or range work.

.45 Auto Rim Specifications & Typical Performance

We keep it simple and purpose-built, currently offering our proven 45 Auto Rim Low Pressure 185gr SWC load, tuned specifically for shaved-cylinder .455 Webley revolvers and similar vintage actions

  • Bullet: 185gr cast and coated SWC (.453″ diameter) – smooth feeding, minimal leading
  • Velocity: ~650 FPS from a 6″ Webley barrel (October 2024 recipe: cleaner burning, more consistent)
  • Pressure: Safe ~12,000 PSI – easy on old steel, no risk to shaved cylinders
  • Components: New Starline brass, non-corrosive primers and powder
  • Packaging: 50 rounds per box

Delivers solid terminal effectiveness with that classic semi-wadcutter bite, perfect for range work or keeping the old warhorse exercised.

Bullet Types & Use Cases for .45 Auto Rim

Right now, our focus is laser-sharp: the 185gr coated SWC low-pressure load, the go-to for anyone running a shaved .455 Webley Mk VI or similar converted classics.

  • Range & Plinking: Accurate, soft-shooting, and easy on the gun, punch paper or ring steel without beating the cylinder or your wallet.
  • Collector Shooting: Historically appropriate feel with modern consistency, exercise that heirloom safely, no moon clips required.
  • Light Defensive Use: Real .45 diameter with semi-wadcutter crushing power, better than nothing in a pinch, though we always recommend proper defensive calibers for carry.

We built this one load because it’s what these old revolvers truly need. Premium coated lead cuts leading and Starline brass reloads like a dream.

FAQs: .45 Auto Rim Ammo

Q1. What is .45 Auto Rim ammunition?
A. The .45 Auto Rim cartridge is a 1920 rimmed version of .45 ACP, created by Peters so WWI M1917 revolvers could run without half-moon clips. Same .451″ bullet, added thick rim for headspacing, simple genius.

Q2. How is the .45 Auto Rim different from the .45 ACP?
A..45 Auto Rim vs .45 ACP: Identical ballistics potential and bullet, but Auto Rim has a 0.095″ rim instead of an extractor groove. Means native revolver use – no clips needed and our load runs lower pressure for vintage safety.

Q3. Can you shoot .45 Auto Rim in a .45 ACP revolver?
A. Absolutely, any .45 ACP revolver (S&W 1917/625, etc.) will happily chamber and fire .45 Auto Rim ammo without clips. It’s often smoother and the preferred way for clip-free shooting.

Q4. What firearms are chambered for .45 Auto Rim?
A. Original M1917 Colts and S&Ws, plus a ton of shaved-cylinder .455 Webley (especially Mk VI). Modern runs are rare, but if it’s a .45 revolver without clip cuts or you just hate fiddling with clips, this is its perfect diet.

 

Revive Your Classic .45 Revolver the Right Way!

Grab Your Box of 185gr SWC Now

Got questions? Call 330-840-7086 or email info@steinelammo.com and we’ll walk you through compatibility and recommend the right load.