The 'skid marks' can be checked easily...
Simply load a round half way, and then pull it out...The 'skids' are usually from a sharp edge on the inside of the receiver on the 'loading gate hole'...This is usually cured with a fine stone or emery cloth on the inside edge, and then cold bluing with a 'pen'...
I second the ring of crud...
Serious cleaning of the chamber, and then try a different brand of magnum loads...
Then you can always go from there if Warranty work is needed...
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