If your going single shot model m will work just fine
Model ct works great for cheytac and they are the same size action beside ct being designed with larger bolt for cheytac.
If your looking for larger I would check into
Bat model L not sure if their larger actions come in lapua BF.
Pierce actions are also great But have pretty good lead times.
Was gonna go pierce for my cheytac but with wait I ended getting a model CT and jjrock super xl and didn't. Have to wait 6-12 months