Got a big price reduction (as a donor) because of the rechambering. The agreement is for me to pull the barrel and give it to him. Neither of us wants an A-Square that has been messed with, and he doesn't want the liability of a gun altered to .338 x .378 even if it would work. Not sure what I'll do with the rifle, but I won't go back to a .338 A-Square. Maybe a .338 Lapua? I do have the forming die, and full length set (all RCBS), some formed brass, etc. that will be for sale.
The magazine is a fabrication and is tack welded to the bottom of the rails. I haven't tried the .358 Norma in the magazine, but I doubt it'll latch in. The Lapua might.
Thanks to all.
Tom