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cylinder dimensions

This is a discussion on cylinder dimensions within the Ruger Single Action forums, part of the Pistol & Revolver Forum category; Does anyone here know or can tell me where to find out the exact dimensions of the various single action cylinders? Specifically I want to ...


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Unread March 13th, 2020, 10:39 AM   #1
 
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Cool cylinder dimensions

Does anyone here know or can tell me where to find out the exact dimensions of the various single action cylinders?

Specifically I want to know which larger caliber cylinder, if any, would drop into a .30 carbine New Model Blackhawk without exterior modification.

Obviously Ruger would be appalled at the idea, but the plan is to sleeve the larger caliber cylinder to accept 7.62x25 ammo.



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Unread March 13th, 2020, 10:50 AM   #2
 
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Unread March 13th, 2020, 10:54 AM   #3
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Ruger built in a safeguard…. as the caliber gets larger, the length of the cylinder gets longer. In other words a 357 cal is longer than a 30 carb, a 41 mag is longer than a 357 mag, a 44 mag is longer than a 41, and a 45 cal is longer than a 44 cal. This is to prevent using a larger cylinder with a smaller bore. I don't know the exact dimensions but I don't think your idea would work unless you reamed an existing 30 Carb cylinder.
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Unread March 13th, 2020, 10:59 AM   #4
 
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If I was you I'd lean towards one of these in a long cylinder 5 shot
https://www.magnumresearch.com/bfr-big-frame-revolver/
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Unread March 13th, 2020, 05:03 PM   #5
 
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As to cylinder lengths, I've noticed this with my .45 Colt Blackhawks and one Vaquero: A .45 ACP cylinder will not always swap from one Ruger to another. I have a Blackhawk, 4 5/8" barrel length, and one Blackhawk with 7 1/2" barrel, both were returned to the factory for fitting with .45 ACP cylinders. (This was before .45 convertibles were factory available. Ruger would retrofit an ACP cylinder if returned to the factory.)

The ACP cylinder fitted to the 4 5/8" gun will fit (and work) with my original Vaquero and an ex-Bisley. It will not fit in the 7 1/2" Blackhawk, nor with that gun's cylinder fit any other of my Ruger .45s.

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Unread March 13th, 2020, 06:08 PM   #6
 
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When this idea was pitched me to I thought it sounded a little too simple. I don't know if the machinist/gunsmith who came up with it intended to custom fit the larger caliber cylinder to the .30 cal frame or if he thought it would fit right in. The way he said it I assumed the latter.
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Unread March 13th, 2020, 06:40 PM   #7
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henry0reilly, Cylinders have three critical measurements …. the length of the ratchet column, which regulates headspace, the length of the body, which regulates B/C gap, and the length of the gas tube on the front, which regulates endshake. All must be within a couple thousandths or the cylinder won't work properly. As I noted before, the easiest conversion would be to ream the chambers of the 30 Carbine cylinder that came with the gun to 7.62x25. You already know the cylinder will fit. A 7.6x25 generates about 35k psi, well within the safe operating standards for a 30 Carb cylinder.

I have never done this conversion before, however I did play with a conversion for a 357 Bain & Davis, which is a 44 mag case necked down to 357". The problem with the 357 B&D is the same thing you will encounter ….. because of the tapered bottle neck case, when a cartridge is fired the spent cases will want to thrust back tight against the recoil shield, which binds up the cylinder and prevents is from turning. Basically you end up with a single shot and at best a 2-shooter. The 7.62x25 is a great pistol cartridge but if it worked well in revolvers, we would have seen many of them before.

Last edited by Iowegan; March 13th, 2020 at 06:46 PM.
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Unread March 13th, 2020, 07:18 PM   #8
 
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Quote:
Originally Posted by Iowegan View Post
henry0reilly, Cylinders have three critical measurements . the length of the ratchet column, which regulates headspace, the length of the body, which regulates B/C gap, and the length of the gas tube on the front, which regulates endshake. All must be within a couple thousandths or the cylinder won't work properly. As I noted before, the easiest conversion would be to ream the chambers of the 30 Carbine cylinder that came with the gun to 7.62x25. You already know the cylinder will fit. A 7.6x25 generates about 35k psi, well within the safe operating standards for a 30 Carb cylinder.

I have never done this conversion before, however I did play with a conversion for a 357 Bain & Davis, which is a 44 mag case necked down to 357". The problem with the 357 B&D is the same thing you will encounter .. because of the tapered bottle neck case, when a cartridge is fired the spent cases will want to thrust back tight against the recoil shield, which binds up the cylinder and prevents is from turning. Basically you end up with a single shot and at best a 2-shooter. The 7.62x25 is a great pistol cartridge but if it worked well in revolvers, we would have seen many of them before.
I can vouch for this. I had an S&W Model 53 .22 Jet, which was a .357 mag necked down to a .22. It was a fireball, but I was lucky to get three shots before I had to hit the cylinder with the ball of my hand to open it. The chambers had to be kept scrupulously clean to do that. This was mostly shooting reloads so I imagine the resizing lube played a part in that it was almost impossible to get it all off a loaded cartridge.
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