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Where's the copper??
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Picture of bartsche
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Two of the 7.62 X 41s were shot last week with cast gas checked bullets followed by some jacketed bullets. While cleaning there was hardly any evidence of copper fouling!!

Having only limited experience with cast bullets I never recognized this event before. Confused

Has anyone shared this experience before? bewildered roger


Old age is a high price to pay for maturity!!! Some never pay and some pay and never reap the reward. Wisdom comes with age! Sometimes age comes alone..
 
Posts: 10226 | Location: Temple City CA | Registered: 29 April 2003Reply With Quote
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Picture of MuskegMan
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Lead is slick and acts like a lube, doesn't it?

That's why we had leaded gasoline, to lube the valve train.

Akin to having your bore lined with moly - albeit lead it not quite as slick.

But I don't have personal experience in the matter, so everything I say is subjective.


 
Posts: 2097 | Location: S.E. Alaska | Registered: 18 December 2003Reply With Quote
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Yes I have. Not definitive mind you. First let me say I have recovered cast bullets of my own creation which started out life as being oversize and fitting the throat closely, with no lube grooves. The bullets were heavily lubed externaly with waxy-lube. The bullets were fired down a two-groove 303 Brit which means they got swaged to bore diameter with two narrow 'inverse' rifling lands as opposed to grooves. These left no lead in the bore and showed no sliding, scuffing, polishing nor any sign of having slid down a bore. Then, just for fun, I lubed the jacketed bullets for this gun. At first with a 'ring' of waxy-lube filling the boat tail, then just dipping the bullet nose and shank into molten waxy-lube after loading. No copper! (And good accuracy too!) Oh, this bore has rust damage and has been fire-lapped. Now on to my hornet. It has a badly rust damage bore but on average, over its length, the bore is all there (no sign of bore damage on recoverd bullets). This bore never collects any copper (nore lead). But - I lube the bullets! In fact, I seat them in a waxy-lubed paper cup. I did shoot some light load through it without lube or paper cup and recovered bullets showed no sign of sliding, scuffing etc. In fact, they showed heat stain in the grooves. So, I am suggesting that it is the lube from the cast bullets that have prevented copper fouling in your case. And as suggested, the lead may be part of the residual lube.
beer


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303Guy
 
Posts: 2518 | Location: New Zealand | Registered: 02 October 2007Reply With Quote
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Picture of bartsche
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quote:
Originally posted by 303Guy:
So, I am suggesting that it is the lube from the cast bullets that have prevented copper fouling in your case. And as suggested, the lead may be part of the residual lube.
beer


thumbOnce again the Kiwi hits the gong! Thanks beerroger


Old age is a high price to pay for maturity!!! Some never pay and some pay and never reap the reward. Wisdom comes with age! Sometimes age comes alone..
 
Posts: 10226 | Location: Temple City CA | Registered: 29 April 2003Reply With Quote
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Lead will typically not start to "strip" out of a barrel until it hits about 1500 FPS. Lube does act as a preventer of this. Are the lead bullets miked so they will actually contact the rifling or does the gas check help impart the spin necessary for bullet stabilization.
 
Posts: 554 | Location: CT | Registered: 17 May 2008Reply With Quote
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quote:
Are the lead bullets miked so they will actually contact the rifling ...
Was that question directed specifically at Roger re his particular bullets? Mine engage the rifling from right near the nose.


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303Guy
 
Posts: 2518 | Location: New Zealand | Registered: 02 October 2007Reply With Quote
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Picture of bartsche
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quote:
Originally posted by 303Guy:
quote:
Are the lead bullets miked so they will actually contact the rifling ...
Was that question directed specifically at Roger re his particular bullets? Mine engage the rifling from right near the nose.


popcornare these phalli representations before and after Viagra? homer

I doubt that the gas check can impart any torque to the Lead. If anything it might just get spun off and that has happened to me and taken out chunks of a number of my Chronographs. fishingroger


Old age is a high price to pay for maturity!!! Some never pay and some pay and never reap the reward. Wisdom comes with age! Sometimes age comes alone..
 
Posts: 10226 | Location: Temple City CA | Registered: 29 April 2003Reply With Quote
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rotflmo Yup - the bottom one has been 'bumped' a little! Big Grin

I have had bullets that show slipping of the gas check ie the groove in the gas check is narrower than the groove in the lead bullet body.

beer


Regards
303Guy
 
Posts: 2518 | Location: New Zealand | Registered: 02 October 2007Reply With Quote
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