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Old 01-30-2015, 06:39 PM
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Can excessive endshake cause sticky extraction? Can excessive endshake cause sticky extraction? Can excessive endshake cause sticky extraction? Can excessive endshake cause sticky extraction? Can excessive endshake cause sticky extraction?  
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Default Can excessive endshake cause sticky extraction?

I'm not sure if this question would be better posed here or in the gunsmithing category....

Was talking with my brother recently about how S&W tuned up my 460v addressing an excessive endshake issue. He suggested that I go through the work-up process again since the work on the revolver was done...

And that got me thinking.....

Given the pressure that 460 S&W runs, and then throwing in nearly .006" endshake (S&W considers .006" out of spec, and mine was a loose .005") is it possible it could cause sticky extraction?? It makes me wonder if the cylinder jack-hammering with excessive endshake could sort of slam the case heads hard enough to make them stick??

Also, it seems to me that endshake is directly related to headspace. Can this be a symptom of excessive headspace?

I'm kind of thinking maybe I should go through the work-up process again and see what happens... Unless of course I get a resounding "No" for an answer...

Last edited by RIDE-RED 350r; 01-30-2015 at 06:40 PM.
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Old 01-30-2015, 07:30 PM
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Can excessive endshake cause sticky extraction? Can excessive endshake cause sticky extraction? Can excessive endshake cause sticky extraction? Can excessive endshake cause sticky extraction? Can excessive endshake cause sticky extraction?  
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I haven't loaded for a revolver in years, but sticky extraction is more a sign of over pressure or rough/dirty chambers.
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Old 01-30-2015, 09:30 PM
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Can excessive endshake cause sticky extraction? Can excessive endshake cause sticky extraction? Can excessive endshake cause sticky extraction? Can excessive endshake cause sticky extraction? Can excessive endshake cause sticky extraction?  
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Are you getting any pierced primers? I have this issue with out of spec head space in a colt.
I'm no pistolsmith, but I don't think end shake would cause that.
But what about build-up at the cylinder throats, like when you shoot shorter cases with dirty lead/lube /powder rounds? The 460 can shoot 45 colt too I believe. .. you been shootn any of them lately ?
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Old 01-31-2015, 03:11 AM
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Can excessive endshake cause sticky extraction? Can excessive endshake cause sticky extraction? Can excessive endshake cause sticky extraction? Can excessive endshake cause sticky extraction? Can excessive endshake cause sticky extraction?  
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I'm guessing this is related to your previous posts stating your 460 had sticky extraction before you reached a max powder charge?

My "off the top of my head" thought would be that it would not make a diiference. If it did wouldn't the same (max) loads have different symptoms when shot in a semi-automatic pistol & then in a revolver, like with the 10mm auto cartridge? You'd have to have two different upper limits because of the different headspacing, if it did, wouldn't you?

It wouldn't take much to recheck a particular load you know had a problem without a complete workup. Just make a few loads under what you use now & a few over to see what you get, if your curious.

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Old 01-31-2015, 11:53 AM
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I have yet to fire Casull or 45 Colt out of my 460 and I clean it thoroughly after each outing with it. Dirty chambers were not the issue.

Never had any pierced primers either.

And yes BlueDot37, posting in that other thread got me thinking. It raised the question in my mind if that extra hammering due to excessive endshake could contribute.

Thanks for taking the time to entertain my theory. Sounds like it most likely would not be the case. I might however try to push it a little bit again and see if the issue persists. It's not because I fell I need to run it to the max, more of a curiosity thing that I need to satisfy...
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Old 02-01-2015, 02:41 AM
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Default Work-up loads

No problem finding out where the redline is. I usually end up running them in the lower "sweet zone" anyway.

One thing I didn't mention that might apply, or at least keep in mind, happened to me when doing some 460 work-up loads. On one of the several work-up combinations I was doing that day I had sticky extraction & flatten primer on the second round for that powder weight. I usually only load two rounds of the next increased load at a time to test but this time I had put four in. After firing the first pair & checking them I got ready to fire the second pair but stopped to wait for the person in the next lane to step back from the bench to avoid any side blast on them.

After a short delay I fired them & noticed the problem when I checked. I stopped testing that work-up batch, & even pulled the remaining one's later, & initially I could see no reason for the symptoms, which appeared several grains below the manual's max.

Thinking back I realized that I had already fired the gun a lot before that work-up batch & because I had stopped in between sets, and waited a bit, the hot gun heated the cartridges unusually high & caused the excessive pressure signs. I later retested that combination, working up to the max, without any problem. So now I'm mindful to not allow ammo to stay loaded, especially after a long session, when the cylinder's hot. I'm guessing you encountered your symptoms more than once so this may not apply to you. Just a thought.

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Last edited by BLUEDOT37; 02-01-2015 at 02:43 AM. Reason: .
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