i was searching through the forum for info and want to make sure i am correct. i had a 22 hornet barrel fitted to my sb2 frame, just for curiosity i found out that it also fits perfectly on a sb1 frame that i dont use. as i understand the articles i could find searching through the forum this should be safe to shoot. but i want to make sure that i am correct. Even though the hornet has a higher pressure rating than a 12 ga., the pressure exerted on the frame is lower due to the small size of the case head. Now i know that any other centerfire rifle cartridge would be out of the question for the sb1 frame and that ilion will only fit shotgun barrels and pistol cartridges on the sb1, but it would be nice to put this frame back into use