I believe it is a .408" diameter bullet, it would make sense since I believe Woodleigh supplies the bullets loaded in the factory amunition. What is .408" in metric 10,3mm? I agree that the .416 is a better round. I noticed in the drawings it has a sloped shoulder like the .375 H&H, would that reduce the powder capacity? The ballistic charts state 2375? In a conversation prior to the post that is a very high pressure load. I just wonder if it is anymore effective than the .375?

Aleko