35Whelen, I think it best if you do a chamber casting to determine what the cartridge dimensions really are & hence properly identify your round.
As to bolt faces, surely you could open up the face (only if you need to) if it is proven to be an incorrect bolt for the rifle?
Yes it will still mean a headspacing check, but at least you will have peace of mind that you can fire it safely which is the most important thing!
In regards to your Schmidt and Habermann Mauser, all I can say is that you unfortunately acted in haste & got rid of it. Yes the 9.3x64 round would have mated up perfectly with it!
You are not alone at doing boo-boos like that, believe you me!