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Setting up a Full Length die.

 
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  #15  
Old 08-11-2009, 02:03 PM
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Re: Setting up a Full Length die.

Quote:
Originally Posted by woods View Post
Here's a question but first let me set it up. As discussed when you set your die so that it has started resizing the case body, it starts pushing the shoulder forward. On once fired cases the shoulder is typically a few thousandths away from contacting the chamber shoulder.

Question

In your experience, when sizing once fired brass, is it possible to push the case shoulder far enough forward to contact the chamber shoulder?

Last time I checked, I was only able to push the shoulder .001" or so on once fired cases and that was not enough to enable the body die to contact the shoulder and place it exactly where I wanted it. Is there any other way to accelerate the brass expansion sequence so that you can size for a slight crush fit on once fired cases?
I've had dies that would not touch the shoulder of once fired brass, this will happen with smallr/tighter chambers.

Sometimes the shoulder does not move forward as you start to resize the case. In my WSM (the example I documented), the case did not grow at all during the resizeing, I think this is due to the chamber being pretty tight compared to the die, so the amount of body resizing that took place was minimal.

To get the growth forward you are asking about, I only know of 2 methods.
1) high pressure loads.
2) Use a load that allows bullet to land contact for the first firing. This is no different than fireforming for wildcats. This method, along with high pressure is probably your best bet.

AJ
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  #16  
Old 08-11-2009, 08:37 PM
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Re: Setting up a Full Length die.

AJ , I was doing it the way you described . I bought a set of the redding comp. shell holders . they are in .002 increments . they just seem a lot simpler to me . I've read that the die will be more square to the shell holder if you bottom it out against the shell holder . whats your opinion on them ? this should be the same thing only a different way of achieving it . thanks Jim

http://www.redding-reloading.com/pag...hellhldrs.html
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  #17  
Old 08-11-2009, 10:29 PM
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Re: Setting up a Full Length die.

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Originally Posted by jimbires View Post
AJ , I was doing it the way you described . I bought a set of the redding comp. shell holders . they are in .002 increments . they just seem a lot simpler to me . I've read that the die will be more square to the shell holder if you bottom it out against the shell holder . whats your opinion on them ? this should be the same thing only a different way of achieving it . thanks Jim

http://www.redding-reloading.com/pag...hellhldrs.html

I use them, in fact I used one of the shell holders in the pics, since I left my standard shellholder at Dogdingers house. On my 7mm Mag, I can adjust the die to just touch the +.010" shellholder and then reload with the +.002" shellholder and get a perfect bump. I like them and have them for the mag boltface as well as the .308 boltface.

AJ
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  #18  
Old 08-12-2009, 01:02 AM
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Re: Setting up a Full Length die.

Thanks for sharing.....we need more of these "how to documentaries". It just takes a little time and thought and is worth a thousand words.
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  #19  
Old 08-12-2009, 01:09 AM
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Re: Setting up a Full Length die.

Woods,

Yes, but I think it depends on the chamber and die.

I started loading for my dad's (old but mint) 308 on the weekend.

The way I set up the gauge this makes sense to me, but simply look at the difference.

Once fired brass was X.X28" as I sized I went as high as X.X32" at one point. For that combination therefore 4thou "increase" in case head to datum line distance at a certain setting.

The die does seem to be sizing the base and body a lot before even touching the shoulder and sizing effort is quite a bit, even on my Rockchucker with Imperial wax. Far more than my 300WM in a Redding body die.

The brass is an once fired (old) local brand that seems quite thick (I'll measure necks at some point) and I suspect something like WW may size easier, but I've never got into brass thickness and sizing effort, so I've no idea if this would have any effect.

The dies are mid 1980's RCBS.

Ideally I like to neck size only and then set up the die to bump the shoulder only after 3 or 4 firings of neck sizing only. I've got no way of sizing the 308 necks only at this time, so I've set it up right away. I think that the 3 -4 firings way is a better way to allow for minimum resize. I generally find that even with full loads shoulders are only formed really nice and crisp after minimum 2 and preferably 3 firings (I suppose that takes us back to the discussion on springback! hmm...). Anyway, that tells me that I still have some slop after a single firing. Once I feel that slop is taken up I adjust the die (under normal circumstances).

Not that I have a wealth of experience, but just how I do it....

I've used the bullet in the lands as AJ described to take up excess headspace on a first firing. The other way is to create a false shoulder (never tried it). As I understand it you expand the neck one caliber up and then partial size it back down to create a jam fit. You can do this with new brass.

Last edited by LRHWAL; 08-12-2009 at 01:13 AM. Reason: Added last paragraph.
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  #20  
Old 08-12-2009, 01:24 AM
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Shims or Redding comp shellholders

Oh... and I currently still use the Redding competition shellholder (I think it's called). This allows for contact between the die base and the shellholder and you can "customise headsapce" adjustment whilst still making die/shellholder contact. You could also put a washer shim over the case between the shellholder and the die.

Whether this is desireable is probably another question.

I suspect that takes care of creating a "dead length" sizing set up which in theory may be more repatable. For me it was an easy way to set up the die. Certainly easier than screwing it down in little bits. Is it money well spent? Well.... not sure, but it's also easy for me, within limits, to change the headspace now by swapping the shellholder and leaving the die untouched if I want to check something out.
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  #21  
Old 08-12-2009, 05:28 AM
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Re: Setting up a Full Length die.

Excellent! Thanks for the education and of course for sharing it ... esp to a newbie like me.

V/R

Ed
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