Yeah, I've been researching it for about a week now and haven't come up with anything. Just thought I'd check, to make sure I wasn't missing something. The closest I came was a long shot (no pun intended) 375 Ruger necked down to 7mm, with a 180gr Berger. That was all just speculation tho'. I think I could get a 7mm Wby out to about 1,200 yards. Maybe.
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What about ( and this would be a lot of money, work and short case life) a 7mm/375 ruger ackley improved with the 180 gr bergers or heaviest matrix ( I think its a 190 or something gr) bullet? In a hot load should send the 180's to 3300fps. Man that would cost a lot for a reamer, custom dies and all! Try it and let us know!