Ted
There is only one thing changed with unmodified scopes since four years ago. That is the introduction of the March.
I say four years ago because that is when many of us started freezing scopes and using external adjustable mounts. As far as I am concerned, if you use any internal adjusment scope besides a March, it will give you trouble sooner or later.
Those that put screws in scopes such as the Sightron, Weaver, B&L, and other "universaL Japanese designs" are not addressing the real problem, which is the gimble joint design that they all share. In fact, I have seen one "modification" that actually puts the erector tube in deflection, because the screws are pushing against the tube with nothing on the other side to back it up.
I think the Tucker conversion on the 36 Leupold is a sound fix, it does address the main problem the erector tube changing position in the gimble joint. But the 36x Leupold is the only scope that lends its self to this type of modification, as it does not share the same gimble pivot design as the Sightron, Weaver,and B&L.
I have switched over to 50x Marches, the seem to be rock solid. Two are on 30 BR's, one on my favorite 6PPC Sporter, and one is a spare. The glass leaves a little to be desired on the 50x March as compered to a 40 x March and the 45x Leupold, but I live with it, knowing the thing isn't moving around.
I have not had first hand knowledge of anyone having a March fail. I have heard stories, but no body seems to willing to swear to it, so untill they do, I consider the March worth the money.
I think the best set-up, other than the March, is the frozen 45x Leupold on Gene Bukys TSI mount. It is very reliable, plus you get that great Leupold Glass. The truth is, it is every bit as good, if not better than a March, but some shooters shy away because adjusments can be a little tedious. But heck, what is that when weighed against a system that does what a Benchrest Sighting System is supposedto do, remain rock solid, all the time, shot after shot. It sure is a great option ifyou happen tohave a Leupold 45x laying around.
Much was said about the winning team at the World Finals using Marches, but remember, the World Champion, Gene Bukys, used a Frozen 45x Leupold on his own external adjustable TSI Mount. Check out his overall aggs compared to just about everybody elses. Sort of speaks for its self.......jackie