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The necks on mine run about .330" loaded on average. I would say if the fired neck is .336" then that isn't the problem but worth trying some different brass anyway. If thats ok then maybe you can pick up another shellholder and have someone take .010" off the face of it. This will give a similar effect of using a small base sizer die as it will allow you to push the shoulder back a little farther and also size the body smaller. I would not think it was the dies. It may be the brass, barrel being short chambered or else your bolt could be out of spec. I had one of those where the cup in the bolt face was too shallow and caused the problem you describe. Depth of cup is .122" on one just measured if it helps. A headspace gauge would rule out the chamber and bolt instantly if you could get your hands on one.
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