10mm K frame

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pacecars

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After playing around with my 16-4 6” .327 Federal I am finding that I like it more and more. I have had a few K frames like a Model 53, 17, 617 and a couple of 16-4s in different barrel lengths. I have a 610 which is a great gun but would love a 10mm in the K frame if it is possible. Is it possible to rebore and rechamber a .357 K to 10mm? Has anyone done it before? After Jack Huntington rechambered this on to .327 Federal, D&T and gave it an action job I put the 4X Leupold on it and it just feels right and looks right. It is fast becoming my favorite. Now if I could just have one in my favorite caliber

Ronnie
 
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Ronnie, that’s a cool idea. I’ll bet it would require a 5 shot cylinder, tho.

Have you ever posted a pic of your 327 with the 4X Leupold? I’d love to see it.
 
Is it possible to rebore and rechamber a .357 K to 10mm?

Sorry, no. My Model 646 L frame barely accomodates the .40 S&W (10mm short). Like you said, the Model 610 is a great 10mm revolver
 
Yendor357 said:
Ronnie, that’s a cool idea. I’ll bet it would require a 5 shot cylinder, tho.
Click to expand...

Not necessarily. The Model 646 is a six shot L frame chambered in .40 S&W. I’m not sure if the cylinder window would be wide enough for the 10mm cartridge, but the cylinder diameter would be the same for .40 and 10mm. The pressures are very similar as well…35,000 vs 37,500 psi.
 
It makes sense to add that the only .40cal L-frame ever made, the 646 as mentioned above makes use of a titanium alloy cylinder, and steel would not have worked considering how much is stuffed in to the small space. Without the titanium cylinder, S&W would never have built the 646 as a 6-shot L-frame.

So if you did manage to figure out 10mm in a K-frame, I would have to agree that you're talking five shot cylinder at most.

Not that this helps much -- but I will also say that I love 10mm and I love S&W revolvers and I am not recoil averse (love the .460 Magnum!) but I don't even like .357 Magnum in a K-frame.

I can shoot it, but I do not enjoy it. 10mm in a K-frame would be a gun that I would not enjoy shooting. As a smallish hiking backup, I see the utility. But as a gun for enjoying, count me OUT.
 
I got to thinking about the 5 shot 69 .44 Mag and don’t see why a 10mm 5 shot cylinder wouldn’t work. Obviously it gets way more expensive in having to have a custom cylinder made and then someone to make Moonclips. It would be an expensive endeavor. I guess it will be a no go. I have spoke to a very good gunsmith about a 10mm Python and if he can get the clips worked out we may have a go at it
 
pacecars said:
I got to thinking about the 5 shot 69 .44 Mag and don’t see why a 10mm 5 shot cylinder wouldn’t work. Obviously it gets way more expensive in having to have a custom cylinder made and then someone to make Moonclips. It would be an expensive endeavor. I guess it will be a no go. I have spoke to a very good gunsmith about a 10mm Python and if he can get the clips worked out we may have a go at it
Click to expand...
With regards to the 5-shot Model 69, that is an L-frame, but I agree that I believe a 5-shot .400" would fit and work in a K-frame.

As for the Python, I think I remember either an idea -- possibly a rumor, was it? Way back we had folks discussing a .41 Magnum Python.

Was that something I imagined?
 
Sevens said:
With regards to the 5-shot Model 69, that is an L-frame, but I agree that I believe a 5-shot .400" would fit and work in a K-frame.

As for the Python, I think I remember either an idea -- possibly a rumor, was it? Way back we had folks discussing a .41 Magnum Python.

Was that something I imagined?
Click to expand...

There is a factory Colt Python .41 Magnum floating around. It has come up on Gunbroker a few times but I do t think it has sold or been verified as from Colt. I want to say the starting bid has been $15,000 or so
 
Last edited:
Sevens said:
With regards to the 5-shot Model 69, that is an L-frame, but I agree that I believe a 5-shot .400" would fit and work in a K-frame.

As for the Python, I think I remember either an idea -- possibly a rumor, was it? Way back we had folks discussing a .41 Magnum Python.

Was that something I imagined?
Click to expand...
In 1964 Colt manufactured 5, 41 Magnum prototype Pythons in blue steel. They had even ran magazine ads offering the Python in several different chamberings. These included the well known 38 Special and 357 Magnum and the not so commonly known 22LR, 256 Magnum, 41 Magnum and another that does not come to mind at the moment

It was originally claimed that the 5 prototypes were destroyed when Colt decided not to offer the Python in 41 Magnum, but at least one escaped destruction because I handled it many years ago

There was a Arlington Texas gunsmith affectionately known as "Bubba" that began building 41 Magnum Pythons in the mid 1970s. There was an article by Jack Fowler on the SixGuns website a few decades ago listing the events.

Colt served him a Cease and Desist letter after one of the 41s was returned to the Colt Factory for service.

By that time "Bubba" had built more than 100 of the 41 Magnums. I have a 6" sitting in my safe. It is at the bottom of this very out of date 41 Magnum group photo

41-stable.jpg


A 5 shot L-framed 41 Magnum would be easy. Taurus built them in stainless and Total Titanium in several barrel lengths over 20 years ago, the model 415. I own the 2 1/2" versions constructed in both materials

both%20415s-s.jpg


So obviously a 5 shot L-frame chambered in 10MM Auto or even 10MM Magnum would be easy once you had designed the moon clips
 
Last edited:
pacecars said:
There is a factory Colt Python .42 Magnum floating around. It has come up on Gunbroker a few times but I do t think it has sold or been verified as from Colt. I want to say the starting bid has been $15,000 or so
Click to expand...

Egads to finding any of that .42 Magnum ammo, it’s scarce. Never caught on really, I remember their marketing, they really wanted to “one-up” similar and more established cartridges!

:D :D
 
The K frame 357s are know for cracking the barrel at the forcing cone. Part of it is how thin the barrel is because of the flat spot need at bottom of shank to clear gas ring. Taking another .025 away in that area would really make the problem worse, Plus no way 6 would fit and I doubt 5, the la frame cylind is over .11 larger in diameter than a K frame. If you look at a K frame ratchet with 357 or 38 cases you you will see that there would not be room for the clips needed to hold 40s. Plus, measure the outer wall of an K frame 357 and then take away enough for a 40 and you haven't got much left. Even if you went with just 5 your screwed because you can't move them inward because of ratchet and thin spot on bottom of barrel

Pipe dream, the K frame is maxed out at 357

The L on the other hand could do it
 
I agree with Steelslaver, the K-frame's cylinder and barrel simply cannot safely handle anything beyond a .358" diameter bullet cartridge.
 
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