There is room in the Classics for sure. On the MR it will depend on the shank length, but if it's 1.5 inches or less, it should fit.
To clarify, all these stocks are inlet for factory sporter barrel channels. There is room in the Classics at least for a magnum and/ or a #3, but they would need to be opened up.
They are drop-in for a factory 700 long action BDL with a factory sporter barrel channel.