Don't necessary need to get a rail to use the Burris Signature rings. You can get a set of two piece bases like these.
Burris 2-Piece Xtreme Tactical Scope Base Picatinny-Style Savage 10
The Signature rings only come medium height and larger. I use the mediums with bases like the above with 50mm scopes and they are perfect.
What might determine whether you need a rail or not is the length of the action (short or long) and the length of your scope. Sometimes with a long action and a relatively short scope it can be hard to get the correct eye relief. A rail tends to solve that.
The Signature rings can also help with another problem. If the receiver holes don't line up well with the barrel, the scope will point to one side. This is usually corrected with the windage adjustment on the scope
.But if the offset is significant. It may only be corrected with the offset Signature inserts. A set of bases with windage adjustment fix this also. Leupold make some. Just don't see them used as much in long range stuff since they don't offer the MOA rise.
Talley used to make lightweight rings with MOA rise. I have a set. But I just looked on the net and don't seem to be able to find them anymore....