Dont read so much into the SB1vs SB2 talk on here.
As stated, factory ammo is safe in any firearm in good condition original chambered for that ( any origionally chambered cartridge) cartridge.
The SB1 frame is just fine for about any sane loading you could find or reload for the little 22 Hornet. I wouldn't go so far as to say you cannot blow it up.... But damn close.
CW