Is this going to be a carry rifle or a dedicated lay in the prone long range rig?
I ask as the DBM is cool and all, but it is not super easy to get into positions (at least for me) and hangs up on my gear.
Both of my Savages have the blind mag. A 110 Flat Back in a Bell and Carlson and a 110 338 Lapua sits in a McMillan Game Warden. Single feed on the Lapua as it is a dedicated long range rig (I guess). It had the original HS Precision stock with the AM bottom metal. It was nice but again, not my thing.
The AM bottom metal did fit my older flat back though, so HS Precision with that BM would work if you are set on that.
Otherwise the chassis option seems to be the easiest way to get stocks for Savages that fit them all.