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Old January 13, 2013, 10:58 PM   #1
cptmclark
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Glock 10mm head separation on about 3rd loading

Only with Nickel cases and about at the 3rd reloading. Partial case head separation on friends gun is bad thing, just after switching to loading with nickel cases he said. Careful loader for many years, but obviously somethings wrong here.
What,other than a huge overload, would cause this. Those gasses don't play nice in the magazine area. Maybe opening too early, greasy chamber, ???

Thanks,


Mike
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Old January 13, 2013, 11:47 PM   #2
JohnKSa
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Does he rechamber rounds? Nickel-plated brass is slicker and may not hold a bullet as tightly. If he's rechambering them, odds are he's getting more setback with the nickel than with the brass and that can push discharge pressures up.
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Old January 14, 2013, 12:53 PM   #3
edward5759
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JohnKSa

Sir;
The Nickel-plated brass is harder than standard brass is has been shown to withstand C.U.P. pressure as much as 20% higher than standard brass. I take it that this is being fired in a pistol, and on the third loading of the brass, the brass failed? Is this correct ?? If you are loading near the top of the pressure limits with brass, then switched to a Nickel-plated brass your Pistol may need a heaver recoil spring or the guns original spring is week. The nickel may not be gripping the walls of the chamber and prematurity be opening.
What gun is it in and what load are you using. that would be the next question. It would be safe to say you need to check things out before you proceed any further shooting of this gun...

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Old January 14, 2013, 01:03 PM   #4
Jerry45
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Case head separation cause by week recoil spring? I’d like to hear an explanation of that.

Nickel plated brass is harder. True! Probably why it’s separating on the third loading. Nickel isn’t as pliable as brass so it would be more likely to “crack” after being expanded then squeezed back down. Also Glocks have an unsupported chamber adding to the stress on the case head. Glocks also have a “generous” chamber allowing brass “nickel” to expand more than other pistols.
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Old January 14, 2013, 09:36 PM   #5
edward5759
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ballooning and case head separation is common problems on weekend recoil springs try the 22 pound spring its only 8 to 10 dollars.
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Old January 15, 2013, 12:16 AM   #6
James K
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Years of experience with .38 Special indicates that nickel plated cases do not last as long as plain brass cases. There have been several explanations of that, but I don't know if there is a consensus.

Jim
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Old January 15, 2013, 05:43 PM   #7
Two Old Dogs
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Nickel plated brass is more brittle due to the plating process.
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Old January 16, 2013, 10:23 PM   #8
T Dub All Day
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My factory g20 barrel leaves the brass pretty bulged. Couple that with hot reloads an I can easily see a case lasting only 3the reloads.
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Old January 17, 2013, 12:31 PM   #9
5thShock
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Nickle plated cases are brittle. Use them once.
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Old January 17, 2013, 12:46 PM   #10
Strafer Gott
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.38s are real pussycat compared to Big 10. Higher loadings accelerate metal fatigue. Even the nickel .38 cases split eventually, but usually at the case mouth. More powerful autos require more frequent spring replacement.
+1 for Edward.
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