scale build up because of neck sizing

[mattinPA]

hello
I would like to know if anybody has had this problem with  neck sizing only.
I loaded up 50 rounds two time now with just neck sizing and have found something disturbing .

When I reload my cases I use a brush before and after I put it through the neck sizer to make sure that there  is no power left over from the load before.Well today it was time to full length size the case do to build up of brass that would not let me easily close my bolt. When I full size a case I do the same thing as I do for neck sizing with the brushes.

I  brushed my first case and then put it through the full length die and brushed it again. To my suprise a bunch of  burned up powder came out.  
I had know idea why I had so much come out. I never had this much come out before. I took another case to test what was going on    so I  brushed  it and then ran it through  the neck sizer this time. Not much burn powder came out. So then I ran it through the full size die and then brushed it again. Guess what! Lots of burned up powder came out .

So my conclusion is that I don't get out all of the burned up powder when I neck size only When I re size the hole case it must break the scale that is on the inside of the case.
 If This scale on the inside of the case is not removed it would cause higher pressure and that is not a good thing.

Has anybody have this problem and what can you do about it

  

[Tom W.]

Not wanting to be rude, but have you run the cases through the tumbler lately?

[mattinPA]

Not wanting to be rude, but have you run the cases through the tumbler lately?

I guess you think the case looked  like it has not been cleaned


yes i do use a tumbler before neck sizing or full length sizing but as you can see it does not clean the insides very good.Maybe that's because the primer hole is to small

[wncchester]

A larger primer hole won't help clean inner case walls.  Not much will, actually.  Nor is it anything to be concerned about, really. 

What you are seeing is nothing but caked carbon left by the burning powder, like soot in a chimney.  The carbon is deposited in a layer that won't flex so it pops loose when the cases are body sized.  It is very thin and somewhat soft (compared to metal) and does no real harm to the case or barrel. 

[stimpylu32]

No more soot than you are showing in the cases i'd not worry at all , had it been a table spoon full thats another matter . 

stimpy

[mattinPA]

thanks guys for your input.

I have been loading some of my test rounds very hot. Maybe for some of you this would be no big deal with the scale but I am trying to get the very best out of my rifle. My bullets on some of my test are into the lands very far. If you take the case back out you can see the grooves from the rifling on the bullet its self . This is a very big deal what if I  fired those rounds two more times with just neck sizing only? There might be twice the scale build up. That my make the pressure too much.

I target shoot and I try to make all my loads the same. One little thing like this can make a load that got 1/2 groups start to shoot bigger groups on the target.


I have never seen anything on loading books or on any forums on this subject and thought it would be a good idea to post this for other that my  not know.

matt

[beemanbeme]

Don't worry about it.

Why do you brush your necks after you resize them?  I brush my necks, rolls my cases on a oil pad, tip the case up and press the mouth of the case into the pad (i used to use a Q-tip to lay a tiny bit of lube in the neck but this seems to work as well) for a bit of lube, and neck size.  Then its into the vibrator for a cleaning and then I wipe them free of dust as I take them out. 

[GregP42]

If you want the insides of the case clean as well as the outside you are going to have to go to ceramic media. This is not cheap as you will need a new tumbler also since this is a wet process, but it does work very well. This is what most of the major BPCR and benchrest guys have gone to in recent years. Me, I still just brush the heck out of them.

Greg

[tmar04]

Tumbler?? does everyone use a tumbler? I just wipe my cases on my levis, then stuff them up in the neck size die. Seriously, how necessary is it to make the brass clean and shiny? I haven't invested in one yet. maybe I should. what is a good brand to buy, not too expensive. thanks.

[Lloyd Smale]

Midway sells a fairly good cheap tumbler made my frankfort arsenal. Mine still running strong after 5 years of about daily use. Its not may main tumbler for that i use my huge dillon but its proven to be a good one. If you want to clean the inside of your cases youll have to go with either like was suggested a ceramic medial or try some crushed walnut but look for  a real fine ground grade. You wil probably need to run your tumbler for about 12 hours to clean with it. I have to agree with the others here and say your worrying about nothing. If i was getting pressure signs id be a little nervous but id have to ask you why the hell are you loading so close to dangerous levels to begin with.

[mattinPA]

id have to ask you why the hell are you loading so close to dangerous levels to begin with.

I check all my cases after shooting them for  high pressure signs. I would hope that you know that using diffrent kind of brass can  affect  the pressure in a case. So why not scale  build up ?

 I have found a way to get the scale out anyway that is fast ;   guess I can go back to neck sizing