So....I've got a factory .458 Mark X action.

A threaded and short chambered Shilen .458 WM barrel.

And factory .375 H&H Mark X bottom metal - opened up at the front.

Who has opened up the front of the receiver like the .375 H&H Mark X and made the 458 Lott feed and run like it should out of a Mark X?

I've got no problem fitting the barrel myself, just not comfortable opening up the front of the receiver/feedrails/feedramp. Will send the whole job out to someone who has done it and made it work right.

Thanks - Bryan
fireball168@yahoo.com

Screw the unfitted barrel in by hand and see if it feeds as is. I suspect it will feed as is or very close to it.

Here's what I would do..

move 1/2 of the "undercut" to the back of the mag, and make a new "riveted on nose" (which is what that box has) that only puts 1/2 of the cut out on the front...

then have just about anyone sort out the differences....

oh, and when you recut the mag, you can open it up just a hair, to make it stagger the 458 lotts a bit better

I did it to a model70 a few years ago; was not that big a deal.

I suggest calling David Christman at 318-878-1395. He has doen what you are looking for manyu, many times over the years

quote:

Originally posted by ireload2:
Screw the unfitted barrel in by hand and see if it feeds as is. I suspect it will feed as is or very close to it.

There's absolutely no chance that it is going to feed as it sits. The 458's weren't opened up to the front like the 375's from the factory.

Jim - I sent you an email regarding the project.

Fireball,
got any 458 winmag brass? while it wont prove a thing, it's fun to see

jeffe