Yes now I can sleep tonight!!! 
I keep kicking myself. I have a 340wby sitting up stairs waiting to be turn into a long range machine but I have been thinking of selling it. Since my main LR rifle is already a 340wby. Don't know if I need 2 but I am a 340wby slu*
Having a hard time not buying the mark v in the classifieds 
Just buy it. That way I don't have to. I don't need another 338, but I will if I have to.

I also have two other reamer with Go gauges. With the exact case demensions described above. One necked up to 6.5, the other 6mm and of course the prior mentioned 25 cal. If its a long action you can give my 6.5- .338 Ultra Magnum Improved a try.
What kind of performance were you getting from this? I ran the numbers on a 6.5/375 Ruger and it was impressive to say the least. The Ruger case should be able to run a 130 at almost 3800fps. With 9 more grains of capacity, the 338 RUM case may be able to hit 4000.
Unfortunately I'm working with a short action. That doesn't stop me from running it as a single shot though. I do that with a few of my guns.
I'm beginning to think that I may have finally hit the wall. The only bore diameter between 17 and 50 caliber I haven't played with yet is the 9.3mm. This is a terrible thing to say, but it may be time to stop building guns, and just start shooting them!

It would help if there were more opportunities to varmint hunt around here. If there were some good groundhog or prairie dog spots near by I would have a safe full of 22-25 caliber guns.
Andrew