I don't know what Hoot has, but there was a 9.3x70 R. It wasn't chambered in nearly as many rifles as 9.3x72 R. I suspect that when the 9.3x72R was standardized and a lot of 9.3x72R-E and 9.3x72R-D rifles were re-chambered to 9.3x72R-N ( standardized), It is possible that some( many?) 9.3x70 R were also rechambered. The D and E versions of 9.3x72R did not require new proof after re-chambering, but I'm not sure about re-chambered 9.3x70R. I'm sure it was loaded with lead bullets, but not sure if only lead bullets. I'm pretty sure the Berdan primers used were the 6.45mm (.254") M71 primer, the same as old 9.3x72R primers. Ammo must be shipped through "common carrier", not USPS, and some local offices may be unsure of the regs.
HalfaDouble,
You can also make 9.3x57R(360) from more common 9.3x72R or Starline original length 38-55( 2.124-2.130") cases( my choice) or their "basic" case.
It is likely that the ammo will have a lot that fail to fire, and those that do fire may have the cases ruined by mercuric primers( If the box doesn't say quicksilber frei, they are mercuric). All that said, if no one else wants them, and they are cheap enough, I will take them.
Mike
