I loved the signature rings but they kept coming loose on my 300RUM. So no more of them. I have had dozens of pairs of leupolds but lately have hit some bad stuff. One batch was out of round, the other had a dovetail so loose you could turn it in the base with two fingers. Also hate the fact I have to lap the rings and then cold blue. Can be a 2 hour ordeal.

But recently have found some hotdog rings. They are machined talley one piece base/rings. I wouldn't use em on hard recoilers but I put some on a encore 204 and am impressed.

I would still say Leupold are on top. I just can't afford those talleys.
Leupold (talley if they were not so expensive)
Optimas
Talley alloy one piece
millets