Shooting them through a Ruger GP100. But I am contacting Winchester tomorrow.
Not sure of the tolerances on the GP100...
But I would do the same in regards to contacting Winchester...
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Shooting them through a Ruger GP100. But I am contacting Winchester tomorrow.
Maybe the spec allows for a little wiggle room in the rim size that the thousand year old lee die set doesn't? I've run into weirdness like that with lee sets before that's why I stopped being them.
Take a look in your manual and see if the brass is out of spec. I have run into this with a number of different cases.