Re: 300 RUM Headspace gauge bushing ??
I know that is is a pretty old thread, but I think I know where/why the screw-up happened. Not having seen any charts with those #'s or anything, I'd be willing to bet that the B.350 bushing is what should come up for for the 338RUM, but NOT the 300, nor any other flavor of the RUM. That is because the 338 is the "oddball" of the RUM series, with it's spec calling for a case that is 0.1" shorter than what the other RUMs are. The person who wrote up that original chart obviously suffered a brain-cramp, and got the 300 and 338 RUMs mixed up.