Thanks to Sir Ron, I've now converted my New Haven M70 to a .458WM+. I've been wanting to do this for a long time, and with Sir Ron's coaching on this thread, I got it completed. Also, previous to this and years ago, in correspondence with Sir Bob, I wondered about getting a .458 Lott, and his response was to instead, get a .458 WM and load long since it had a better throat. Standing on the shoulders of giants...

This is the new magazine box:
[Linked Image from i.postimg.cc]

After popping out the rear spacer with a wood chisel, it looks like this compared to the original box:
[Linked Image from i.postimg.cc]

The new, shorter ejector compared to the original, longer ejector:
[Linked Image from i.postimg.cc]

The new, shorter bolt stop compared to the original, longer bolt stop.
[Linked Image from i.postimg.cc]

Finally, look at how much more space is now available! For common reference, the cartridges are vintage Remington 510 SP ammo.
[Linked Image from i.postimg.cc]

Last edited by bcelliott; 08/25/22.