Hahaha year that line works pretty good on the wife! For some reason the guns keep multiplying. Need to start putting condoms over the barrels like they did in VietnamThe 300WM and the 7mm are pretty stout calibers for just getting back into shooting. Not that you cannot do well with either one, but if you are just getting back into shooting, I think that you will have an easier time with gaining proficiency and enjoying the process with a different caliber.
I agree with NorCal's comments. I picked up Ruger Precision Rifle a few months ago in 6.5 CM. It is obscenely accurate and will reach out a long ways. It will also be much cheaper to shoot and will be much more enjoyable for me compared to a 300WM or a 7mm. With hand loads, a .308 can be pushed over 1,200 yards. I've not shot that far, but I read about it from others that have shot that far.
Your post reaffirms to me that there is no need for total need for honesty in a marriage.Does she really need to know how much you spend on guns? Do you really want to know how much she spends on manicures and purses? Buy yourself a safe, so when she sees a new gun, you can say, "it was in the back and I've had it for years." I'm on my second marriage, so take my advice with a grain of salt!