Thanks Naki:

We 9.3x57 shooters can probably guesstimate the velocities you'll get, but I'll be interested in your actual chronographed loads. That shell sounds like a good one, particularly with the many good .375 bullets available. I think you will enjoy a lot of steaks stacked up with that gun. The 56/57 mm shell size offers a good mix of velocity and lack of recoil with the heavy-ish bullets in the 270-300 grain weights.

Do you have available the Hornady 220 and 225 and Speer 235 grain bullets there?

If you have a cruddy old corroded round and care to section the bullet in the interests of science, we'll sure love to see a picture of it!