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Chamber length, and trim length question

 
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  #8  
Old 06-12-2010, 05:57 AM
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Re: Chamber length, and trim length question

I have one rifle that I do this with , it's a factory rifle . the only reason I checked this rifle is I have a big gap between my shell holder and full length die to just bump my shoulder back a couple thou. so I wondered what the chamber length was . I got my notebook now so I have the correct specs for this gun . here is what I have
book max length 2.035
book trim length 2.025
my chamber length 2.072
my trim length 2.050 ( I try to use even numbers )



I see where I should be safe to allow my brass to go to 2.062 trim - 2.072 max . I was just afraid to push it I guess .
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  #9  
Old 06-12-2010, 06:02 AM
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Re: Chamber length, and trim length question

I trim 0.020 less than chamber length.
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  #10  
Old 06-12-2010, 08:53 AM
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Re: Chamber length, and trim length question

Greater than 5-10thou clearance only decreases sealing, and increases carbon build-up, making chamber length a variable..
There is no reason I know of to desire this.
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  #11  
Old 06-12-2010, 10:30 AM
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Join Date: May 2010
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Re: Chamber length, and trim length question

Sammi specs went out the window once I got my guage. Trim only to uniform all my brass. With my factory chamber, I'll never reach max length anyways. I load a lot of the light and shorter stuff, so any extra brass I can safely use, is a bonus. I consider the 7 bucks for the plug, a great reassurance tool to have.

Sinclair recommends .024 from max chamber length. From the many reads I've came across on this subject, guy's are using a whole lot tighter tolerance's then that. Some up to .005. That's only the thickness of an avg. beer can. I would consider .010 to .015 as my min. To each his own.

Quote:
Originally Posted by jimbires View Post
Measure the overall length of the case, head of the case to end of the plug, and note that measurement somewhere obvious and permanent in regards to loading for this particular rifle. It would probably be a good idea to repeat this measurement three times and average all three readings.
I'm not real sure if I may be reading to much into this statement....... But, everytime I've taken this measurement, each reading was exactly the same. If you have to take an average of your reading's, you may have another issue.
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  #12  
Old 06-12-2010, 12:31 PM
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Re: Chamber length, and trim length question

No I got lucky and got the same messurements, except once when the plug rubbed up against the inside otf the chamber. But that was operator error.
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  #13  
Old 06-17-2010, 08:02 AM
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Join Date: Oct 2009
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Re: Chamber length, and trim length question

I was going to say in the plug's instructions Sinclair says 0.024" below chamber length. I would be confident that they're being conservative too. It's the nature of their business.

That said I follow their advice.

Talking theory here, I'm assuming the tighter fit of your brass to the chamber the closer you could go to the actual chamber length as your brass shoulder is nearer to the stop, aka the chamber's shoulder. If you're full length sizing with a lot of headspace my thoughts are that you have more play and movement to worry about. This is probably why the bench rest guns can be run at much closer than 0.024".

Like I said, I'm talking theory and nothing I've tested or watched or anything.
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  #14  
Old 06-17-2010, 04:46 PM
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Re: Chamber length, and trim length question

It doesn't make sense that Sinclair would suggest an extreme clearance from mouth to chamber end. Are you sure they aren't referring to an amount to shorten the neck -for gage usage?
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