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Old 05-15-2018, 10:32 PM
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Default Deleting the gas ring on Kframes

The new Kframe magnums have deleted the gas rings in order to make room for the larger forcing cone.

I shoot only jacketed and semi-jacketed factory ammo.

How many rounds until the fouling becomes a problem? Anyone have any experience?

I noticed my new 66-8 has just a little perceptible endshake. Perhaps this was done on purpose, to allow for some clearance to prevent the cylinder from binding when things get a little dirty?
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Old 05-16-2018, 02:08 AM
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Originally Posted by American1776 View Post
How many rounds until the fouling becomes a problem? Anyone have any experience?

I noticed my new 66-8 has just a little perceptible endshake. Perhaps this was done on purpose, to allow for some clearance to prevent the cylinder from binding when things get a little dirty?
Until the gun starts binding up!

Depending on bullet type, lubrication, powder type and primer and the amount of clearance (diameter) between the yoke barrel and cylinder center bore, there are simply too many variables to even venture a guess! I have a 1948 K-38 that needs to be cleaned every 50 rounds with wad-cutter loads with Bullseye, and others that can go hundreds of rounds with the same ammunition.

No.
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Old 05-16-2018, 06:40 AM
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I shot over 500 factory FMJ and SJHP the first time I decided to disassemble the cylinder and yoke of my 66-8 for cleaning. It was not binding up or malfunctioning in any way. I was curious and just wanted to do it as a preventative maintenance thing. It was fairly clean and probably could have easily gone another 500 rounds before cleaning.
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Old 05-16-2018, 08:06 AM
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I shot over 500 factory FMJ and SJHP the first time I decided to disassemble the cylinder and yoke of my 66-8 for cleaning. It was not binding up or malfunctioning in any way. I was curious and just wanted to do it as a preventative maintenance thing. It was fairly clean and probably could have easily gone another 500 rounds before cleaning.
Seems like the jacketed rounds with factory powder should go ~750-1000 rounds no problem.

As I said, there's a little more endshake than other new S&W's, though not excessive. I'm guessing they left a little more play between the yoke tube and the cylinder face so as to allow more room for fouling before it becomes sluggish.

I can look at this K-frame like a short 1911: great gun for carry, but need to maintain it every 750-1000 rounds (spring change for the short 1911, clean out the yoke tube for the K-frame).
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Old 05-16-2018, 08:13 AM
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Iíve shot as little as 50 with binding issues and as many as 300 rounds without . It depends on what you shoot , I had problems with some low end Titegroup and 158gr SWC Speer reloads the first time I shot my 4.25Ē 66-8. I now know what handloads it likes and no more binding of cylinder. I take cylinder assembly apart for a good cleaning with Kroil and lube with Rem Dry lube about every 500 or so rounds , no more problems.
I really like the balance and feel of my 66 itís a great user revolver.
I wish the Model 19 Classic was available at the time I would have bought one instead because I like blued steel and wood stocks. The 19 is probably my next new Smith.
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