45 ACP vs. 45 Auto Rim load data

[DeplorabusUnum]

I used to shoot AR brass in my 25 using moderate .45 ACP loads and never experienced a problem. Important not to be using any of the old “balloon head” brass. A problem I had to pay special attention to was not using the AR ammo loaded for my 25 in my shaved Webley MkVI and S&W 1917. Sadly the model 25 and 1917 is gone so that is no longer an issue.

No balloon head brass here. Just shiny new Starline.

 

[STORMINORMAN]

For OldRN:

Wouldn't you know it: GRAFS actually has STARLINE .455 Webley brass in stock & available...!

Wouldn't it just figure?

Cheers!

 

[BLUEDOT37]

Starline brass is strong enough

The reason why reloading manual data for the 45 Auto Rim is less powerful than for the 45ACP is because SAAMI max spec for the 45AR is just 15K CUP while the 45ACP is 18K CUP. (The 45 Colt max is 14K CUP)

There is no SAAMI standardized max PSI pressure established for the 45AR, which is 21K PSI for the 45ACP

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The interior case dimensions/capacity isn't the same due to the AR case not having an extraction groove.

I believe 45AR has slightly less case capacity I was always under the understanding that 45AR had a thicker base and was built to handle 45super pressures.

No balloon head brass here. Just shiny new Starline.

Here's some data I measured/collected when I started loading for the 45 Super.

All were from new unfired Starline brass.

Starline says their 45AR brass has the same integrity as their 45 Colt brass, which is every bit as strong/stronger than their 44 Magnum brass.

I've loaded their 45AR brass with the same load as my full 45 Super loads, without issues.

I've loaded their 45 Colt brass to starting 454 Casull loads without issues.

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I load my M325/625s revolvers mainly with 45 Auto Rims.
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[Baltimoreed11754]

I use the same 200 gr rnfp bullet and powder charge for 45acp and 45ar but have found the load spicier feeling in my revolvers. Of course this is due to the autos recoil being soaked up by the slide movement. I tend to download my 45 revolver ammo to be gentler to my 70 year old hands. Don’t have a problem with a 1911.