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I agree with Ornery that maybe you are not length full length resizing and need to screw down your die a little. If you have fired these rounds before and want the accuracy don't full length re-size anyways, just re-size the neck if you are using these in the same gun you shot them out of although this is not the problem you are having now with not closing the bolt down. Did you try to seat your bullet a little deeper to make sure it wasn't hitting the rifling on the barrel. Did you use your calipers to see what your bullet was seated at according to the book?