According to what I've read, A 7mm rolling block action in good shape should be able to handle up to 40,000 psi pressure. Keep your handloads well under that and you should be OK. I've also read that the chamber dimensions of some early 7mm's may vary from current 7x57 dimensions, causing potential problems, including headspace. There are rolling block forums out there that can provide more detailed information. There is no reason not to shoot it, if it's in good shape.