Author Topic: What would blacken brass on one side?  (Read 554 times)

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Offline wreckhog

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What would blacken brass on one side?
« on: June 26, 2010, 04:00:27 PM »
New factory loads. Part of the rim and most of one side look soot covered. Does not appear the affect function. Have not attempted to reload these cases.

These are WWB 38s in a 357 mag.

All I can think is that I really need to clean the chamber before trying any mags.

Offline Smokin Joe

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Re: What would blacken brass on one side?
« Reply #1 on: June 26, 2010, 06:29:04 PM »
Probably just low-pressure blow-by.
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Offline kevinsmith5

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Re: What would blacken brass on one side?
« Reply #2 on: June 26, 2010, 06:44:19 PM »
The 38's are shorter than the chamber, could be blow back through the open throat area. My throated BC does that when I shoot 150 gr collarbuttons....
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Offline trotterlg

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Re: What would blacken brass on one side?
« Reply #3 on: June 26, 2010, 06:46:56 PM »
Just what happens with short brass in a large chamber.  Larry
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Offline gcrank1

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Re: What would blacken brass on one side?
« Reply #4 on: June 27, 2010, 07:17:29 AM »
Yep, the low pressure developed does not expand the brass to 'seal' the chamber. Higher pressure loads, even in 'short' cases will seal it, but it is nice to have some soft loads that work. The old British rook & rabbit rifles used just such. Even our old .38 RF sporting loads were much the same in effect for plinking and hunting.
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Offline petemi

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Re: What would blacken brass on one side?
« Reply #5 on: June 27, 2010, 08:57:24 AM »
Most of my pistol caliber Handis soot the cases with light loads.  My question is, why is yours doing it only on one side?  That seems strange.  Is there something wrong with his chamber?

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Offline dangerranger

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Re: What would blacken brass on one side?
« Reply #6 on: June 27, 2010, 10:42:56 AM »
Mine will do that with the lightest of cowboy loads[under 600fps]. if I keep them over 800fps I dont see it anymore. Ive never seen it with factory loads. Id give the chamber a good cleaning and  try it again. if that didnt fix it find a bore scope to see more of the chamber.or it might just be short brass in the long chamber.  DR

Offline gcrank1

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Re: What would blacken brass on one side?
« Reply #7 on: June 27, 2010, 03:35:36 PM »
Or....it might be an oversize chamber, with the case laying on the bottom. Next time check to see if the black is always oriented in the same place as it extracts.
"Halt while I adjust my accoutrements!"
      ><   ->
We are only temporary caretakers of the past heading toward an uncertain future
22Mag UV / 22LR  Sportster
357Mag Schuetzen Special
45-70  SS Ultra Hunter with UV cin.lam. wood
12ga. 'Ol' Ugly OverKill', Buck barrel c/w  SpeedStock  and swap 28" x Full bird barrel, 1974