John: The only thing I will say,is, I have as much personal experience with Montana actions as I want.This includes looking them over several times at my gunsmiths' shop,and shooting a friends 375 H&H,which BTW,works and shoots well,after it was "tweaked" and barreled by my smith.
After speaking with my gunsmith about them,and considering the over-all cost of a custom rifle;and hearing a few "horror stories" such as 7 Rem Mag experienced,I concluded long ago that I did not want one.
Montana's are,I understand, cast at the Ruger plant; I would rather have a Ruger Hawkeye than a Montana. At least I know the Hawkeye will work.
I'm unlikely to "change my mind" either;could result in getting a lousy action,and I would, of course,be to blame....