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BunnyKiller
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Posted: February 16 2018 at 3:30pm | IP Logged Quote BunnyKiller

I noticed something a bit odd about my SW460... it will
misfire on 454 Casull on a rare occasion, but it will
fire the misfires on a second try... what I noticed is
that the round will slide forward and backward in the
cylinder just enuf to be either against the cylinder or
away from the cylinder... if it is away from the
cylinder, it will misfire. When I "point" the gun upwards
( letting the rounds slide to the "loose" position)and
shoot the gun, the chance for misfire increases. When I
point the gun to the floor and then level it out and
fire, there is no misfire.
So.. Im guessing that when the pin engages the primer
while the round is in the "loose" position it also pushes
it forward with a loss of impact power to hit the primer
correctly...

my question is... has any one here had a similar
experience with revolvers doing this too... or is it a
design flaw in the 460? my 629 44 has never done this to
me...
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mikld
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Posted: February 17 2018 at 1:23pm | IP Logged Quote mikld

Nope, but 99% of failures to fire for new reloaders, in
stock guns is primers not being seated all the way to the
bottom of the primer pocket. "it will misfire on 454
Casull on a rare occasion, but it will
fire the misfires on a second try...".


Perhaps driving the case and the primer forward increases
the chance of a FTF.

Edited by mikld on February 17 2018 at 1:23pm


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Ham Gunner
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Posted: February 17 2018 at 5:17pm | IP Logged Quote Ham Gunner

A buddy had a SW 460 and we noticed that the .454 Casull case was not a perfect fit in the head/rim area of the cylinder. The rim of the Casull is thinner at the edge and slightly smaller in diameter than the .460 or .45 Colt cases. His revolver never experienced any failures to fire, however.

I do not remember the brand of .454 Casull ammo that he had, but I think it was most likely Hornady. Different brands could possibly have even more issues with cylinder fit at the rim area. Or it could just be that your individual revolver has a bit more room at this area of the cylinder allowing slight more than proper case movement.

If I remember correctly, the Casull uses small rifle primers, so even a mix up with small pistol and small rifle primers should not be the issue as they are the same size in both diameter as well as depth in the primer pocket.

Edited by Ham Gunner on February 17 2018 at 5:22pm


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Buffalogun
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Posted: February 18 2018 at 5:46pm | IP Logged Quote Buffalogun

Bunny,

It may be that your revolver was made with a little extra tolerance in the cylinder/frame area. Couple the loose fit with the small rifle primers used in the .460 and it can add up to misfires.

Rim thicknesses of the .460, .454 and .45 Colt are very close on paper.

Were you using cast bullets, you could increase the OAL so the bullets ogive would rest against the throat and hold the case head back against the frame. I wouldn't try that with jacketed bullets.

I think I'd contact S&W and let them check it out.


Mike

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REM1875
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Posted: March 08 2018 at 8:29pm | IP Logged Quote REM1875

So far i have not experienced the same but will pay
attention to that if I have it happen. Thanks for the
heads up.
Crimp appears to be a critical factor in this so sliding
a bullet forward would only work in the 460 only and if
we have somewheres else to crimp lower.
Any problems with 45 Colt (LC)?

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