South African failures

[Double Tap]

I had some curious failures to extract with South African ammo. Just wondering if anyone else has experienced the same difficulty. Ambient temperature was below 50 degrees. First 3-4 rounds would fail then as the chamber heated up they cycled fine. I feel that it is because this ammo was not originally intended for export since South Africa tends to be a bit warmer than the U.S.

[hagar]

South African ammo is pretty hot, so I doubt that is the problem. is your chamber dirty or full of oil maybe? Any rims ripped off, that may be because it is TOO hot!

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I don't have time for busy people

[Ratlord]

After the Alaskan tests it's doubtful that the problem could be low temps....
Could this have been caused by expansion of the breech/gastube/something? Maybe fouling in the gas tube that loosens when it gets warmer and expands?
I'd say clean it down and lube it. Make sure to clean off the gas piston and gas tube really well... a lot of people forget that.

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"It's not the Earth the meek inhertit, it's the dirt." -Mordred, "Camelot"

Mark
San Diego
ratlord@nation-of-rats.net

[Double Tap]

Its certainly not rifle Hygiene. This rifle all of my rifle's are spotless. The bore was MPro'ed and I decoppered it with Barnes. I also cleaned the bolt & carrier with MPro as well as the gas system. The rife was perfect. All I can say is that in temperatures around 75 degrees the stuff worked fine. In temperatures around 42 degrees it failed.

[Brian in MN]

I have some 8mm Mauser that likes cold weather. The primers take 2 or three hits in summer and in winter after the rifle begins to heat up. The first five rounds work great in winter, after that it is back to double tapping them.

[W.E.G.]

What about the recoil spring assembly?

It doesn't matter how clean the grease is. It can affect cycling if the grease thickens as the mercury falls.

Try degreasing, and repeat the test.

[Hambone_22345]

Failure to extract?

or Failure to eject?

First place to look at for FTExtract is chamber condition, and extractor spring tension.

First place to look at for FTEject is gas/recoil system. Check for "short stroking"(not enough pressure from the gas or too much resistance in the bolt/recoil spring). Make sure the bolt moves freely in the slots in the upper when the upper/lower are broken open. Make sure the recoil spring assembly is not gummed up with excess lube. May have been the problem described by gj, excessive lube would "free up" after a few rounds are fired. HTH