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7mm UM Loads

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Unread 04-01-2004, 10:54 PM
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Join Date: Sep 2002
Posts: 453
Re: 7mm UM Loads

dwm, will not see this!!!! My smith has chambered (in his estimate) 40 barrels (with HIS reamer)in this caliber with not one single problem. In his opinion,..the large throat (factory),..coupled with the overbore nature of the case,..and SLOW powders show this exception. The neck of the case just can't expand fast enough to seal,..and some of the gasses are reverted back past the shoulder,..which when the neck does seal,..compresses those trapped gasses,..and they collapse the case. The collapse marks look like you took a pair or vice grips and crimped the case 1/4 way. The collapse marks are ~.3" long and about .25" deep, right at the body/shoulder junction. This has been observed on a buddies sendero as well as a Mcmillan in the smiths shop. The smith has stated that with his reamer,...and the subesquent tighter tolerances,...this is a non-issue. You are good to go,...try the 94gr load at/into the lands with the 162gr a-max. You may find the sweet-spot lower as I am sure your throat is shoeter. But in the sendero,., shot beautifuly.

[ 04-01-2004: Message edited by: JustC ]
You try to get closer to the target,..and I keep trying to get further away.
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