We wore out reamers by the dozens building these back in the day when 06 brass was available by the ton and 8mm brass was as rare as hens teeth and berdan primed to boot. This was a popular conversion. You could find 8mm bullets but no reloadable brass.
Aside from the brass issue it made no sense, and when brass became available it quickly died out. It got the job done just as well but wasn't any better than the original. 8x57 was a hammer...I liked it.
To avoid all the drama, I just re-barreled my rifles to 30-06, then my $50 Garand had ammo too.
That German surplus MG ammo was real pretty.
