powder residue on neck

The Accurate Reloading Forums

This topic can be found at:
https://forums.accuratereloading.com/eve/forums/a/tpc/f/2511043/m/163100439

21 September 2008, 23:31

Bobby B.

powder residue on neck

Can anyone shed some light on this for me? What causes the black podwer residue to form on the neck of fired cases?

Bobby B.

22 September 2008, 01:54

Jim C. <><

Carbon in heat and pressure.

22 September 2008, 02:31

bartsche

Sizing lube for one.

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..

22 September 2008, 02:37

Hunt-ducks

THE POWDER YOU PUT IN THE CASE!!!!

22 September 2008, 04:25

Bobby B.

OK,OK, let me rephrase the question. Why am I getting the black marks on the neck of my 6/284 cases and not on my 7RM cases?

Bobby B.

22 September 2008, 05:09

Ol` Joe

Lower pressure...

------------------------------------
The trouble with the Internet is that it's replacing masturbation as a leisure activity. ~Patrick Murray

"Why shouldn`t truth be stranger then fiction?
Fiction after all has to make sense." (Samual Clemens)

"Saepe errans, numquam dubitans --Frequently in error, never in doubt".

22 September 2008, 05:13

Ol` Joe

Actually the powder gases are likely flowing back along the neck walls before the pressures are high enough to expand them and seal the chamber. It`s a common occurance.
Sometimes slower powders are more apt to show this then faster ones, and starting loads are known for it.

22 September 2008, 05:25

shootaway

quote:
Originally posted by Ol` Joe:
Lower pressure...

could also be from a cool barrel

22 September 2008, 07:46

Hipster

quote:
Originally posted by shootaway:
quote:
Originally posted by Ol` Joe:
Lower pressure...
could also be from a cool barrel

So a cool barrel that has not expanded in the chamber area would cause this?

And a chamber and barrel that has expanded somewhat form heat due to firing would not?

Work hardened brass will soot up, even more so with slower powders and some powders just dont burn the cleanest in some cartridges. I found this to be the case in a couple of calibers once brass had a few reloads on it in factory cut chambers.

22 September 2008, 10:05

tsturm

quote:
Originally posted by Bobby B.:
Can anyone shed some light on this for me? What causes the black podwer residue to form on the neck of fired cases?

Bobby B.

IMR 4064 in a 30-06

22 September 2008, 23:48

shootaway

quote:
Originally posted by Hipster:
quote:
Originally posted by shootaway:
quote:
Originally posted by Ol` Joe:
Lower pressure...
could also be from a cool barrel

So a cool barrel that has not expanded in the chamber area would cause this? And a chamber and barrel that has expanded somewhat form heat due to firing would not?

Work hardened brass will soot up, even more so with slower powders and some powders just dont burn the cleanest in some cartridges. I found this to be the case in a couple of calibers once brass had a few reloads on it in factory cut chambers.

No,shooting on a cool or cold day compared to a warm or hot day.