I am interested in doing one and would like some feedback from those who already have. Specifically, I am looking to build a gun and load around bullets in the 200 to 225-grain range using a 23 to 24-inch barrel.

Be patient.....I have a sneaking hunch it's going to be a commercial round in a short time! If not it should be.

It should approximate the .340 Weatherby if that helps you!

jeffe could be working on that too

Its been done by the wildcatters and its a great round apparantly..I am told Ruger has one in the shelves awaiting production at some point. However, I don't see how one could improve on the .338 Win., its such a fantastic round as anyone that has used it to any extent will testify to. I personally wouldn't want more velocity or more recoil, if I did then I would grab my .375 H&H or whatever.
But if I were playing games and I tend to do so, I would be thinking about a 9.3x375 Ruger and the 320 gr. Woodleighs. Holy smokes!

Anyone heard any more on a 338x375 Ruger?