http://www.accuratereloading.com/450vs.html
If you reduce the barrel back to 22" of the Model 70 458 those 748 loads should do at least 2350 f/s.
This seems to be a much better option than the Lott, if 458 factory ammo as an option is not important.
Brass would be dearer since 404s are used, but conversion costs would be far less. If it fed alright there would only be rechambering costs.
Mike
If you are considering long magnums (458 lott), then why not use the 450 vincent long?
The advantage of the 450 vincent short seems to be that it fits in a 458 win mag length magazine box.
But if your mag box is already opened up for the H&H length of calibers, then the 450 vincent long would seem to have all the advantages.
I was thinking that those shooters who owned M70 458s might find the 450 Vincent Short an easier and cheaper conversion than the 458 Lott.
As a bottle neck cartridge it should also feed with greater reliability.
Mike
If you already have a .458 in a .375 length action, upgrading it to a Lott gives you the distinct advantage of still being able to fire standard .458WM ammo. Kind of a "cake and eat it too" situation. From a practicality point of view, this is a pretty big advantage.
If I were faced with the choice, however, I would definately lean toward the Vincent. Aesthetics are important to me, and I find the bottle-necked, unbelted case a lot more "sexy".
FWIW,
Canuck
I like the sloping tapers of the 375 H&H and 404 Jefferys as it goes well with feeding and extraction...look like torpedos.
DGR like men, horses, dogs require a primary trait with me and that is dependability first and foremost.
------------------
Ray Atkinson