First off, what action is your father's 7mm RM built on? You might be able to go back with a nice factory stock if it's a Winchester, Remington, Ruger, or other commercial rifle. That is the first option I'd exhaust.
If you're handy you can make a Richard's stock work. I've used about a half dozen or so over the years on old military sporters. Inlet is usually oversized and the barrel channels rarely run straight. However, there is enough wood on the outside of the stock to fix the barrel channel issue. Bedding fixes everything else.
Honestly if you want to go affordable, I'd look at Boyd's Stocks. IME they are more drop in ready and require less work, but you lack some of the wood options. Being more of a finished stock makes them a better value in my eyes than Richard's stocks.
