9three and Jabal - you are missing the point - don't cloud the issue here with facts - the 'trendy' thing to do today is to crank up the .450 Lott and run down the .458 WM because it's 'the thing to do, don't you know' and because you can burn a lot more powder to get the same ballistics if you use the bigger boiler room - that's a fact.
: I'm surprised someone hasn't necked up the .416 Rigby to .458 just to run down the Lott 'in turn'- afterall, you can get the same ballistics at much lower pressures - of course, you would neck the .5 Browning down to .458 and get the same 2,150fps ballistics at much lower pressures than the Rigby/WTBY cases. Pretty soon, we'll be dealing in negative pressures - HA!