I just got a handful of once fired 30-30 cases, and the seller mistakenly had a smaller handful of 303 Savage cases included with the exchange. I don't really blame him, he was great to deal with, shipped really fast, communicated well with me and had everything packaged in an extremely neat and durable manner. Also, the brass has been relatively clean, considering what I could be getting, and appears to be a relatively good amount of care taken in getting them here, and probably a lot of pre-sorting before selling.
Anyway, the 303 Savage looks pretty similar to the 30-30, and I don't expect that case to be that common. Just a tiny oversight. But I was wondering if it's possible to make 30-30 brass out of it. I see the dimensions are pretty close, but the 303 Savage is considerably shorter, and the base diameters differ by ~0.0020.
Didn't have much luck searching online to do this. A lot of threads on converting 30-30 to 303 Savage, but not the other way.