IIRC- 9.3x57, Rod, used sided down 270gr. Hornady SP's on BIG wild cattle with perfect results.

He also found that sized down 235gr. Speer .375's also penetrated better from his 9.3 than when shot from a .375 AS .375 bullets.

Sized down 225gr. Spire Points (also worked well for Rod) are already loaded for testing in my bro's 9.3x57. They will be running 2,550fps. We want to test them on plates to 300 meters as they have a 200 meter zero right now.

These have a 1/16" thick jacket - that's .0625" thick and is the same thickness of jacket on the new 350gr. .458 bullet from Speer, the one that needs to be driven faster than 1,900fps to expand.