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7mm RM chambering help

 
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  #1  
Old 12-08-2006, 10:17 PM
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Location: Fountain, CO
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7mm RM chambering help

Long time lurker with a challenge;

I am recently loading for a Remington 7mm RM PSS I bought a year ago, and I have ran into a problem with loads. I cannot get full length sized rounds to chamber in this rifle! Details;

1. Two different dies, RCBS and Redding, neither of which work. Both dies size to specifications (neck, head diameter, etc) via caliper as sort forth in Hornady, Sierra, and Nosler manuals.

2. Cases which do not "fit" the PSS slide into my Savage 111 smooth as silk.

3. Chamber was polished out by local reputable gunsmith.

4. Out of the bag Winchester brass, with no prep what so ever, chambers great (that really confuses me)

Am I missing the obvious?
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  #2  
Old 12-08-2006, 11:07 PM
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Re: 7mm RM chambering help

Sounds to me like you have excessive runout (crocked necks). This will cause this. If your Savage has more clearance than your 700, they will chamber easy. If your 700 is somewhat tight, the crocked necks and also bullets will cause MAJOR resistance. That is why new cases go in so easy.

The minute you touch those cases with an expander ball, youre hosed! You will need to throw away the expander ball and turn your necks down to where when you run them trhough the full case sizer, the necks are sized for .002-.004" neck tension. If your dies are too tight in the necks for this, you will need a body die and then neck size with a Redding type S and the right bushing.

Hope that helps!

Good luck!

Been that, done there!! [img]/ubbthreads/images/graemlins/laugh.gif[/img]
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  #3  
Old 12-09-2006, 08:19 AM
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Posts: 186
The die is not screwed down far enough...

Sometimes the press has to "Cam" over on the full length sizing operation. Many people make the mistake of screwing down the die until it touches the shell holder with out a piece of brass in the press. Then when they put a piece of brass in the shell holder and actually size the brass, they see a gap inbetween the shell holder and the bottom of the die, which I think is not your problem.

Good luck!
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  #4  
Old 12-09-2006, 08:28 AM
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Posts: 920
Re: 7mm RM chambering help

Some information you didn't give...

1 - Do the fired cases go back into the chamber?

2 - Do the FL sized cases (empty) go back into the chamber?

If both DO go back into the chamber, then do the following.

Measure the neck OD of a new round, and measure the OD of a reloaded round and see if there is a difference.

And (God I hate to say this), are you using the right Dia bullets? (It HAS been know to happen, even to experenced loaders).

The thing that is fishy is that you say you have used TWO FL dies, and the cases are not chambering.

You do NOT need to neck turn the cases if they orginally went into the chamber.

.
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  #5  
Old 12-09-2006, 08:33 AM
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Re: 7mm RM chambering help

[ QUOTE ]
Sounds to me like you have excessive runout (crocked necks).

[/ QUOTE ]

Whatsa "Crocked neck"... My kid brother has been crocked a few times, but it didn't effect his neck [img]/ubbthreads/images/graemlins/wink.gif[/img]

[ QUOTE ]
You will need to throw away the expander ball and turn your necks down to where when you run them trhough the full case sizer, the necks are sized for .002-.004" neck tension. If your dies are too tight in the necks for this, you will need a body die and then neck size with a Redding type S and the right bushing.

[/ QUOTE ]

That's a lotta unnecessary work. For a tight neck bench or match rifle, OK...
... but for a factory chamber?? If the chamber needs that much work, the gun is a problem and needs to go back to Big Green!

.
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  #6  
Old 12-09-2006, 02:31 PM
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Re: 7mm RM chambering help

What is a lot of work is trying to get straight brass with an expander ball in the die.
__________________
Long range shooting is a process that ends with a result. Once you start to focus on the result (where the shot goes, how big the group is, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.
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  #7  
Old 12-09-2006, 02:34 PM
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Re: 7mm RM chambering help

So I missed the second o in crooked. Never miss spelled before?
__________________
Long range shooting is a process that ends with a result. Once you start to focus on the result (where the shot goes, how big the group is, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.
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