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Author Topic: How much Build-up from Lead?  (Read 6097 times)

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Offline Riptide439

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How much Build-up from Lead?
« on: April 13, 2013, 07:45:27 AM »
Fire test rounds in of 9mm 125gr LRN & 122gr LFP using 231 - about 50 rounds total.
on about 30% of the fired cases, there is wax build up in the extractor groove.
Is this normal?
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Offline Duckie

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Re: How much Build-up from Lead?
« Reply #1 on: April 13, 2013, 08:08:07 AM »
Can't say I've seen this on any of my fired reload cases. Mine were Dardas "Blue Lubricant" rounds.

Dardas Blue Lube Specifications
Hardness = 75 (Shore A Scale)
Color = Blue
Flow Temperature = 109 Degrees Farenheit (plastic flow)


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Offline SMSgt

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Re: How much Build-up from Lead?
« Reply #2 on: April 13, 2013, 11:07:52 AM »
I haven't noticed that, but if you're using light charges, there may not be enough pressure buildup to seal the case and powder/wax is blowing past it into the breech.
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Offline Jake G

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Re: How much Build-up from Lead?
« Reply #3 on: April 13, 2013, 11:27:03 AM »
You should have wax build up in the extractor groove.  I shoot a lot of lead bullets and you will get more powder fouling and the gun may get dirtier.  Some powders foul up a gun worse than others with lead bullets.  Is there that much extra lube on the bullets?
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Offline Riptide439

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Re: How much Build-up from Lead?
« Reply #4 on: April 13, 2013, 01:11:46 PM »
Quote from: Jake G on April 13, 2013, 11:27:03 AM
You should have wax build up in the extractor groove.  I shoot a lot of lead bullets and you will get more powder fouling and the gun may get dirtier.  Some powders foul up a gun worse than others with lead bullets.  Is there that much extra lube on the bullets?
Jake - Thanks. So it is OK for some wax in the extractor grove - is that correct?
I was at 4.7gr of 231 which is on the high side for the charge. One 8 of the cases from the 4.7gr did have a bulge at the head so I believe I am at the edge or high.
This was the cleanest of all the test loads from 3.8 to 4.7. Should I be concerned about the case bulge?
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Offline Jake G

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Re: How much Build-up from Lead?
« Reply #5 on: April 13, 2013, 02:05:59 PM »
That was suppose to say "shouldn't".   I've never seen lube in the case rim groove and it shouldnt be there.  Guess my smart phone auto corrected.  I've never used 231 so I can't speak about charge weight but if I'm reading this correctly you are getting a bulge where the feed eamp is located?  If thats the case I'd back it down as I use range brass and the last thing I'd want is to blow a case head.  If your not getting the accuracy you want I'd try a different powder if/when you find it.  I load lead 160's in my 9mm for IDPA and play the game with running low recoil loads that meet power factor.  If I want to load hot I stay with jacketed bullets, however, I usually don't load hot for target shooting.
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Offline Riptide439

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Re: How much Build-up from Lead?
« Reply #6 on: April 13, 2013, 02:52:25 PM »
Accuracy was nice with the 231 but was better with 4756. I think I will stay with the 4756 since it was very accurate with lower charge.
I did try a BNH21 this batch. My gut tells me it not be obturating enough and i am getting some blow back. Does this sound accurate?
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Offline jameslovesjammie

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Re: How much Build-up from Lead?
« Reply #7 on: April 13, 2013, 03:21:58 PM »
Quote from: Riptide439 on April 13, 2013, 02:52:25 PM
I did try a BNH21 this batch. My gut tells me it not be obturating enough and i am getting some blow back. Does this sound accurate?

This sounds pretty accurate to me.  Have you looked down your barrel yet?  If you have what almost looks like tinsel in the rifling from chamber to muzzle, your bullets are too hard.
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Offline Riptide439

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Re: How much Build-up from Lead?
« Reply #8 on: April 13, 2013, 05:37:39 PM »
Already cleaned JLJ but I will load a few more and hit the range in the morning.
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Offline noylj

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Re: How much Build-up from Lead?
« Reply #9 on: April 14, 2013, 03:45:15 AM »
I have no idea how you can get wax/lube into the extractor groove.
It won't hurt anything, but the question is why is it there...
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Offline Wobbly

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Re: How much Build-up from Lead?
« Reply #10 on: April 14, 2013, 07:50:03 AM »
Quote from: noylj on April 14, 2013, 03:45:15 AM
I have no idea how you can get wax/lube into the extractor groove.
It won't hurt anything, but the question is why is it there...


+1

I get a waxy lube buildup inside the seating die, but that's about it. No buildup in the gun.
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Offline Riptide439

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Re: How much Build-up from Lead?
« Reply #11 on: April 14, 2013, 09:51:39 PM »
Well - I put 50 122gr LFP thru my 75B & 50 thru my P07
Same result with some lube/wax build up in the extractor groove. When I cleaned the barrels, you seen build up in the rifling in the first 1/2" in both barrels. From that point forward the barrel was normal.

I think the burret is too hard and not obturating until 1/2" into the barrel. Does this sound like a possibility?
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Offline noylj

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Re: How much Build-up from Lead?
« Reply #12 on: April 14, 2013, 10:26:55 PM »
I would like to see a picture of the "lube" in the extractor groove.
Now, are your talking leading or lube in the first part of the barrel. How much lube is on these bullets.
If talking leading of the barrel, a clue to what is causing the leading is where the leading first begins to appear.
If it appears near the chamber, chances are that bullet diameter or hardness are the cause. A diameter too small or an alloy too hard will allow high pressure gas to leak past the bullet, which erodes the bullet and leaves leading near the chamber.
If the leading first appears on the leading edge of the rifling, the bullet might be too soft or the velocity too high.
If the leading appears in the second (front) half of the barrel, the bullet is running out of lube.

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Offline Riptide439

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Re: How much Build-up from Lead?
« Reply #13 on: April 14, 2013, 10:49:27 PM »
Here are 4 from today

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Offline Wobbly

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Re: How much Build-up from Lead?
« Reply #14 on: April 15, 2013, 12:03:09 AM »
Man, you gotta get a day job.  ;D


If the wax/lube was coming from the bullet, then there would need to be a trail down the side of the case. There is no trail, therefore there is no excess bullet lube.

IMHO, it was the Extractor in the Library with the Pipe Wrench.  O0
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