I have decided to embrace the suck of my one and only .458 Lott. Ol'Fugly is changing her name back to Miss Piggy Warthog. She is the MKX Mauser .458 WinMag that was opened up in length and re-chambered to .458 Lott Like Jack Built. I blame my youthful ignorance for that.
Any SAAMI .458 Lott owners can cure their affliction by throating to match the original .458 Lott wildcat.
Load like a .458 WM+ and just trim the .458 Lott brass to fit the mag box length if ogive length requires it.
Regarding the Lott: I skimmed through an article titled .458 Lott in Rifle, May-June 1991 by G. Sitton. Per the article, with collaboration of David Miller & Curt Crum. Sitton used a a Ruger #1 458 Winchester that David Miller re-chambered to 458 Lott. Of the powders of the time, that they used, Sitton stated that IMR 4320 was the only powder that gave him a comfortable 2,300 fps with a 500 grain bullet. He states that Jack Lott and David Miller, both arrived at 84 grains of IMR 4320 being the answer for 500 grains at 2300 fps. He also states, that David Miller "had to give some of his rifles as much as .600 inch of freebore to cross the line without pressure frights."
I don't have the free bore / throat dimensions of the 458 Winchester re-chambered to 458 Lott committed to memory. I would have guessed of the top of my head, there would have been more the .600" from end of case to rifling on a re-chamber. ??
