Case trimming help needed

Don Fischer said:
Uncle Nick couldn't be more right. sizing stretch's the case more than anything!
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Ditto. Resize THEN trim. When the size die squishes the case diameter down to spec it forces brass to move up, thus lengthening the case. Listen to UncleNick. And read a manual.
 
Quote:
Originally Posted by Don Fischer View Post
Uncle Nick couldn't be more right. sizing stretch's the case more than anything!



Ditto. Resize THEN trim. When the size die squishes the case diameter down to spec it forces brass to move up, thus lengthening the case. Listen to UncleNick. And read a manual.
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I do not expect an answer but reloaders on all forums insist they can bump:eek: the shoulder back and then:) they do not understand the neck of the case is connected to the shoulder of the case at the shoulder/neck juncture so if they are able to move the shoulder back the neck comes with it.

I did not expect anyone to understand the Wilson case. The Wilson case gage is a datum based tool. The Wilson case gage was not designed for reloaders that that have no clue how long the chamber is from the shoulder/datum to the bolt face. For the 500ith time I have a 30/06 chamber that is .016" longer from the shoulder to the bolt face than a minimum length sized case. I know I am wasting my time because of the limited audience. What is a minimum length sized case? How much longer is a chamber that is .016" longer than a go-gage length chamber?

So there was a big argument I was not aware of but one of the individuals involved had a mill for sale, I drove over and purchased the mill; and then I got involved. The disagreement was complicated by go-gages, the man I purchased the mill from had 20+ 30/06 head space gages that went from go to beyond. He also had the old head space gages that measured from the case body/shoulder juncture to the case head. I explained to him it did not matter, I could measure the length of the chamber from the shoulder to the bolt face with any gage he had and I could modify his go gages to measure from go to infinity, to make his life simpler I decided to go without the a go-gage.

With factor new over the counter R-P Green Box 30/06 ammo he had .0075" clearance, that would be just over half way between a go-gage and a no go-gage length chamber.

And then it really got complicated because I have 35 bolts that would fit his receiver and he had 100+; between us we did not have a bolt that would correct the length of the chamber.

Who does not have fired 30/06 that are longer from the shoulder to the case head by .0075"? Had we gone looking I do believe we could have found 10.000 30/06 cases that could be sized to fit his chamber. Problem: He wanted a go-gage length chamber.

I did not ask him about measuring the length of the case from the mouth of the case to the case head. His chamber was .0025 longer than a go gage length chamber; when trimming what is a reloader to do with the .0025" or when trimming cases for my long chamber what am I to do with the .016" difference in length between my chamber and cases?

F. Guffey
 
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Did you try using some loktite?
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.016" seems a little extreme but I have to add the .016" before I start by trimming .033" from a 280 Remington case.

The 280 Remington case is helpful when determining the length of the chamber from the end of the neck to the bolt face; I should say the 280 Remington case is helpful to me when determining the length of the chamber.

F. Guffey
 
I am not the worlds greatest cook (usually don't use locktite either) and granted I don't have transfers and standards.

But I can follow a recipe. This is from the Gerard Tri Trimmer manual

This tool is intended for
use with full length resized cartridge cases
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I should have made it clear, I don't do anything but full re-size.

If anyone is interested in the whole manual on the Tri Trimmer, this is the link.

http://www.giraudtool.com/uploads/8/2/0/0/82007436/giraud_tri_way_trimmer.pdf

Some detail about not trimming with a non resized fired case or only a neck sized case as it does not work correctly.

Oh and it comes with a fired and resized and trimmed case.
 
I took my die apart and the resizing die expander button measures at .271. I am guessing this is where my problems are coming from. If anyone reloads 270, uses full length sizing dies and could confirm I would be grateful.
 
I have three different brand .270 sizing dies. The expanders on a RCBS and a Bonanza measure .275. The expander on a SAECO measures about .276. So it would appear your .271 is a bit undersize. That of course would explain the trouble with the pilots sticking tightly in the case mouths.

Ask RCBS to send you another .270 sizing die stem and expander, or even a new sizing die.
 
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size a case and measure the inside diameter of the neck. a .271 diameter neck should not fit on a .273 pilot
 
my cases get snug on the pilot because of the burr on the inside of the neck from trimming. I trim it a little back the case off the pilot then finish trimming it.
 
So I called RCBS and told the guy on the other end of the line the .271 diameter of the expander ball on my sizing die. He told me that it was .005 too small. He got my address and is sending me a new one in the mail. Great customer service and should fix my trimming problems for my 270. Thanks to everyone who gave suggestions and insight. This really is a helpful place.
 
RCBS is great in taking care of things like that. I rarely need to call them but when I have over a small part they usually send me a couple replacements for free. Every manufacturer is going to have the occasionally out of spec part, and great customer service like that goes a long ways to making it OK. Most reloading companies have better than average customer service.
 
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