If memory serves me correct, he mentioned that the surplus ammo he fired in his, which was Brown Bear..about the same as Wolf.. fired almost all, except with maybe 1 or 2. It was also mentioned that Rossi might have put a stronger spring in these type receivers, but I am not so sure. If I had a few I would attemp to take one apart and see, but I don't. Still even if a stronger fireing spring was there, I don't see it making much a difference because the firing pin can only extend so far till it stops. Seems with good factory ammo, hunting ammo, that this isn't a problem.
A member here used a VERY thin shim, held by only a dab of oil against the transfer-bar on his 7.62x39 Handi. And all forms of ammo seemed to work fine after that. Though that also presented the problem of over penetration of a primer and possibily pearcing any 7.62 ammo that did not have a deep set primmer. A matter of some debate as I remember. When I find the link I'll try and post it, it was a pretty interesting read.
All in all I can see both sides of the fence, those wanting to shoot surplus ammo for cheap trills in a rifle easily scoped , and the ones that only believe that you should leave that "junk ammo" to the surplus rifles it was made for. To each his own, and everyone finds fun in different areas.
I guess we really didn't think about the possibility of the 7.62 ammo not firing in a Handi due to the hardness and deep set primers when we all clamored for barrels offered in this calibers. Only the bore diameter of .312 to .308 and the possibility of an over bore is always there...
Still I would have liked for NEF to at least make the 7.62 barrels availible throught the accessory program for those that want the caliber for other reasons than surplus unloading.