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Adjusting Die to Chamber?

 
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Old 04-03-2010, 05:21 PM
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Adjusting Die to Chamber?

I did a search on this and found some answers but none seem to answer my question. First off Im shooting 7mm rem mag and I have Redding Fl sizing die. I had the understanding that if I set my die up to where it is just touching the shell holder and size my cases, that eventually with enough firing my cases wouldnt chamber once fire formed and completely streched. I guess what I'm getting at is I have 3 time fired brass, that still fits in my chamber no problem. Whats the deal?
Thanks
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Old 04-03-2010, 06:01 PM
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Re: Adjusting Die to Chamber?

It's too windy to shoot so I'll give this a go...

7mm Mag is a belted case. The cartridge headspaces on the belt not the shoulder. This remains true "if" one is pushing the shoulder back, however slightly, to maintain close to the original distance from case head to shoulder.

I suspect that resizing the cases is pretty much effortless?

However if you back the sizing die off a few thousandths what you expect to happen will happen. The cartridge will shift to head spacing off of the shoulder as with non belted cartridges.

IF you are satisfied with velocity and accuracy that you are now getting you are in tall cotton. No reason to change anything. Your case life will be good and your powder stocks will remain better.

However I'll bet that if you increase the powder charge a bit you'll feel more resistance when resizing then case life will go down due to work hardening and brass flow as pressures go up.

My saying has been 'more powder is better than less powder' and I have a bucket full of worn out cases to prove that's a dumb (and expensive) way to think.
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Old 04-03-2010, 06:09 PM
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Re: Adjusting Die to Chamber?

So I guess I dont understand what your saying, am I sizing them too much or what can I do to change this, I'm confused. Thanks for the reply, this is not an easy thing to explain.
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Old 04-03-2010, 06:25 PM
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Re: Adjusting Die to Chamber?

I believe that what Roy is trying to say is... if your cartidge is chambering with the full length resizing and you are happy with the performance you are getting from your hand loads, don't change anything. If your not feeling the press stroke cam over at the bottom of your resizing stroke and the brass still fits in the chamber after 4 fierings, your GTG.
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You can bet your ass on that !!
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Old 04-03-2010, 07:13 PM
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Re: Adjusting Die to Chamber?

So what your saying is Im not working my brass too much? How much life can I expect out of it. Thanks
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Old 04-03-2010, 09:29 PM
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Re: Adjusting Die to Chamber?

Ovastafford, if you haven't already, I would invest a minimal amount in a decent tool that will let you measure your headspace on the shoulder. With this setup, you can minimally size your shoulders back about .001-.002 and just treat them as any other bottle neck case. If you push the shoulders on these back too far you will most likely end up with case head seperation. One other area to keep an eye on is the case body just in front of the belt. Record this measurement on once fired brass, as well as brass that has been fired a few times and make sure it doesn't grow. Sometimes it will grow a little and become to large to fit in your chamber. My FL die resizes this area of the body .001 and have never had a problem with them chambering. Just the way I do it.
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  #7  
Old 04-03-2010, 10:00 PM
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Re: Adjusting Die to Chamber?

How do I measure it?
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