I have purposely inspected many 458 Lotts in Africa wherein the PH have shot a ton of 458 Win in there guns and can see no visible damage from this practice and I shot a lot of 270 from short 06 cases many years back with no visable signs of throat cutting, at least no more that one would get from a say 7 STW or 300 WBy...so I see it as a viable practice keeping in mind that a 458 Lott is used for dangerous game up close for the most part and bench rest accuracy is not required, at worst a hogged out 458 would still probably shoot better than most double rifles.