If your rifle has BDL bottom metal, the only DBM I am familiar with that fits your inletted BDL is HS Precision.
It's pretty high dollar, but a very nice option. I just changed from factory BDL to HS on a S/A magnum. I went with a 3 round magazine to keep from having an extended mag hanging down.
If you decide to go that direction, be sure your current round will fit the magazine. Measure your COAL and call HS or check their website for length on the L/A magnum length.
One last thing, if you are using a Jewell or Trigger Tech trigger, it takes a bit of milling to get good clearance. If you call them, ask if they've fixed that.