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Advice wanted on my sizing / brass usage.

 
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  #1  
Old 03-07-2005, 08:12 PM
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Advice wanted on my sizing / brass usage.

Quite some time ago I bought a batch of winchester .308 win brass. I have full length resized it every time I have reloaded it. I clean the primer pockets and trim to length and debur the mouths every time. I know I have not kept track of which brass has been used what number of times but I would swear that some of the ones I am having problems with have only been used 5 or 6 times.

The problem I am having is web thinning. I have been told that each time the brass is FL resized the brass will flow toward the mouth of the case and that if ignored this will (obviously) lead to case head separation.

Questions:

1. Should this be happening after only 5 or 6 FL resizings?
2. Would this be a sign of too much case pressure from my loads as well as sizing? (I'm not seeing any other signs of being over a safe load pressure.)
3. Is this something common to the brand of brass or would this be happening to any brand because of my FL sizing. I specifically bought win brass because I heard rem brass is too brittle.

After all that, do you have reccomendations on how to reduce this problem? I am thinking of buying a batch of Lapua brass and a lee collet neck die. Any comments on this would also be appreciated.

Thanks all.
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Old 03-07-2005, 09:05 PM
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Re: Advice wanted on my sizing / brass usage.

FL sizing every time is moving the brass much more than just neck sizing. I only neck size until I HAVE to FL size. Then when I do FL size, I set my dies up fresh every time and check to see how much I am bumping them back with a Stoney Point Headspace gauge. I like to only bump my shoulders back .002" or less. This will make it fit into the chamber easily, reduce work hardening, make it more accurate, and decrease the chance of making runout worse.

You may have a die that is really short and is cranking the shoulder back very drastically. Then you fireform it forward a mile every time you pull the trigger. Then you crank the shoulder back again and the whole process is like a tug of war match. Back and forth, back and forth until it snaps!
You could also have an unusually brittle batch of brass.

The only way to really see what is going on so that you can start the process of elimination is to get the headspace tool and see if you can fix the problem by changing or adjusting your dies.

My advice (besides getting the S.P. headspace gauge) is to get a Redding S type neck die with the correct bushing, and a Redding Body bump die with Redding COmpetition seater. This will give you the ultimate in control and adjustability.
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Old 03-07-2005, 09:24 PM
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Re: Advice wanted on my sizing / brass usage.

What about the brass brand. If I am going to try a new bullet (one of my other posts) do you think I should look into another brand of brass or do you think a fresh batch of win brass would work with what you've said?

Oh, What is a "body bump" die? I haven't heard this term before.
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Old 03-07-2005, 09:32 PM
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Re: Advice wanted on my sizing / brass usage.

My mistake. That is what I call it. It is actually just called a body die by Redding. It is an open topped die without a decapping stem that just pushes the shoulder back and does not touch the neck at all. That way you move just the minimum amount of brass whether you're neck or FL sizing.

I would try the other things before scrapping the brass. Many folks load Win brass in a .308 without any trouble, so it is unlikely the brass. It could actually be tough-as-nails brass, and your headspace could be a touch to long. [img]/ubbthreads/images/graemlins/frown.gif[/img]
I hope it's not that.
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Old 03-07-2005, 09:34 PM
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Re: Advice wanted on my sizing / brass usage.

Okee dokee. Thanks.
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Old 03-07-2005, 09:43 PM
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Re: Advice wanted on my sizing / brass usage.

4ked Horn,
yes try some better brass, Federal is the best of the domestic but Norma and Lapua are better yet, but I'll bet most of the problems you are having is from oversizing your brass, your other question "what is a body die" it is a die that does not touch the neck so that you can just bump the shoulder back .001-.002" when your brass gets tight in your chamber,then you use a bushing neck die so that you dont size more than is needed and your 308 brass should last 15 firings or more.
B
p.s. most of this stuff is made by Redding or Wilson not hornady,rcbs or tonka
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Old 03-07-2005, 09:54 PM
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Re: Advice wanted on my sizing / brass usage.

I do agree with Brian B about the brass. Lapua or Norma would be the ultimate, but I know how hard it is to pitch brass in the garbage after you just spent 25 minutes per case prepping the Win brass. [img]/ubbthreads/images/graemlins/shocked.gif[/img]
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