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Posted: 11/9/2011 11:54:53 AM EDT
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It seems to be having a problem with 7.5X54mm MAS cases. It is chamfering far more on one half than the other (internally). I have tried adjusting the blade in many different ways, including using a different blade, but seem unable to resolve it. The issue isn't present when trimming .223 or .308 cases. The cases are similar to .308 Win in design.
I can't think of what else to try. The case that was included with the holder is overly short, so I did wonder if given it's a fairly unusual calibre, the holder isn't quite to spec? Need to take more measurements - it was getting a bit frustrating after several hours, so I stopped continuing. Thanks. |
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Check to make sure your decapping rod is actually centered up in the die body and not skewed off to one side, and that it is not bent from trying to deprime some berdan primed cases or heavily crimped military primer pockets. If two other cartridge sets work fine in the machine, and the sample case chamfer is even, it is most probably going to be a brass problem.
When there is an uneven chamfer, it almost always has something to do with the brass. It can be non-concentric case neck to body, inconsistent wall thickness around the neck, loose decapping stem, bent decapping stems, crap in the case rim groove of the shell holder, etc. If the brass is brand new, the case mouths can be all dinged up from being loose packed in plastic bag and to be run thru a die to straighten the dents and dings out. Doug Giraud Giraud Tool Co. |
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Quoted:
I'm not sure about the cause of your problem, but did you try turning the case in the trimmer as it is cutting? IIRC i remenber it helped with .223 cases who's mouths weren't even. Yes, as per instructions. Quoted:
Check to make sure your decapping rod is actually centered up in the die body and not skewed off to one side, and that it is not bent from trying to deprime some berdan primed cases or heavily crimped military primer pockets. If two other cartridge sets work fine in the machine, and the sample case chamfer is even, it is most probably going to be a brass problem. When there is an uneven chamfer, it almost always has something to do with the brass. It can be non-concentric case neck to body, inconsistent wall thickness around the neck, loose decapping stem, bent decapping stems, crap in the case rim groove of the shell holder, etc. If the brass is brand new, the case mouths can be all dinged up from being loose packed in plastic bag and to be run thru a die to straighten the dents and dings out. Doug Giraud Giraud Tool Co. I have had quite a few issues with RCBS de-capping rods. This one is fairly new, so it should be okay. Also tried trimming .303 British with it, but the cases are so variable, I can't manage it consistently. All the cases are Privi, plus some HXP in the case of .303 British - not particularly good quality stuff. Luckily there are a few bags of new 7.5 French I have, so we'll see if that'll work. Unfortunately they are also Privi, but since they've not been through the die, they oughta' show where the problem is. Privi manufacture what is basically the only available 7.5 French in Europe. If the brass is the problem, and I can't prevent the odd chamfer angle, how much is it likely to impact accuracy? The rifle has a very worn bore, so it isn't really very accurate in the first place. Thanks very much. |
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