Hmmmmm
.458 Lott. Stout, abrupt recoil.
This what you are talking about?
http://www.ruger.com/products/m77MarkIIMagnum/index.html
The above link is exactly what i am talking about. The recoil i am not to worried about, i am a big guy and have shot a friends CZ LOTT quite a bit. Always standing, wouldn't be stupid enough to test that beast on a rest. But like i said i am a ruger man so want to stick with it. Got an elephant and buffalo along with some smaller stuff lined up for next year in Zimbabwe. So want to get the LOTT and get a few rounds down the tube before i go. Like i said anything on this rifle good or bad will be appreciated.
I own several M77s from an original tang safety model to two new Hawkeyes in .338Fed and .358Win. Rugers are excellent rifles and perhaps, most important, for your big bore they also have the finest scope mounting system found on any rifle IMHO. Having the rings intergral to the receiver and taking the mounting of a base out of the equation is an excellent way to keep a scope mounting system secure, especially with a caliber that has stout recoil.
For the record, I also own a couple of CZ 550s including one in 9.3x62 and I feel the Ruger system to be superior to CZ's sytem. The Ruger rings are most certainly of higher quality than the CZ supplied ones too. If I was to replace the rings on a Ruger system, I'd look at Warnes first as they are my first choice now for any mounting system. Both my CZ 550s wear Warne rings. One last preference for the Ruger would be that a scope can normally be mounted lower than on a CZ 550 because the bolt does not go as high when worked.
Have you looked at the M77 MKII Magnum Rifle model? They say it comes in .458 Lott. I have an RSM in 30/06 (limited production several years ago) and it is a very fine rifle.
Good Luck!