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Brass Trimming problems

 
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  #8  
Old 11-04-2008, 01:48 PM
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Join Date: May 2008
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Re: Brass Trimming problems

tex3030, I heard the lymans tend to vary consistency, though I don’t have any experience with these trimmers. I use a Wilson trimmer and once its zeroed in it trims to within .001” and most of the time less. I would say it does make somewhat of a difference in performance but not much.. for my 25-06 cases I concentrate more on neck size and chamfering and primer pockets as far as case prep. My cal spec says max 2.494” case oal, and min trim length is 2.484”, I try to stay in between this range at about 2.490”. My chamber is 2.520” measured and they say if you go over max case length do not go closer then .024” of your chamber length. There is the argument though that case length is directly affecting bullet release where the bullet contacts the neck surface. I’ll leave that discussion out of this post. Good luck.
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  #9  
Old 11-04-2008, 02:45 PM
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Re: Brass Trimming problems

I wonder why anyone would say to keep a trim length .024"? I've never had a problem using nearly the full dimension once it's measured in any of my guns. Any more input on this?? (I think we have the original question answered re inconsistant trim length)
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  #10  
Old 11-05-2008, 11:43 AM
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Re: Brass Trimming problems

..as I indicated, my case oal max is 2.494, chamber is 2.520, if I back away .024 from my chamber length, I’ll be at 2.496, .002 over the max SAAMI. I assume there is a safety factor involved and how this number was arrived at I couldn’t say. If the case neck expands and there is debris, dirt, sand brass shavings, powder etc etc, stuck in the chamber, and if you don’t clean your chamber for say many many rounds (or never)and use it in the field the end of the chamber can get bogged up with crud.. If the case neck cant expand enough to release the bullet (and all the gas) will create excessive pressures, obviously could blow up the gun, and maybe a finger or hand or elbow. For persons who use primarily at the bench and/or don’t have custom chambers, I could see how this ‘safety factor’ could be objectionable. If it’s a hunting gun (ie factory bbl) its typically assuming one will use it in the field, which most are made to be abused to a degree. Bottom line, if you know your chamber length and assume 3 to 4 thousands case growth, then you’re fine, but if you’re just shootin hogs, safety’s built in.. like tom cruise said, I just drive, I don’t know nuthin ‘bout cars…
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  #11  
Old 11-05-2008, 01:06 PM
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Join Date: May 2007
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Re: Brass Trimming problems

I found the problem I was having with the trimmer. When clamping the case in I would slide the neck of the case onto the pilot so that the case would be true to the cutting head. When I was clamping the the case in the case would rotate, and at times it would grab the cutting head and unscrew it. I tested it by trimming 10 cases and all were within +-.001. Thank you for the responses.
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  #12  
Old 11-05-2008, 03:37 PM
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Join Date: May 2008
Location: Ohio
Posts: 248
Re: Brass Trimming problems

I’m glad you were able to find the problem. The wilson is similar, it hold the shell in a steel bushing and if the twist the bushing while cutting it will sometimes rotate the set screw and mess up the trim length. Happy hunting/shooting.
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  #13  
Old 11-07-2008, 10:54 PM
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Join Date: Mar 2005
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Re: Brass Trimming problems

You did size your brass before trimming, didn't you? If you trim your brass & then size it, you're going to get different readings before and after sizing...
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  #14  
Old 11-08-2008, 11:51 AM
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Join Date: Feb 2004
Location: Pennsyltucky
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Re: Brass Trimming problems

the best case length trimmer out there is the Lee. it's also the cheapest, most accurate and easiest to use. i have a Wilson and will sell it for 1/2 price if anyone wants it.
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