help with a cartridge ?
My father had a rifle in the 1980,s that fired a rim fire cartridge that looks a lot like the 17 hmr. Just a little bigger . When my dad passed away in some of his stuff I found 2 rounds he had left for this gun that god only knows wear is at now . I think it is a 20 caliber bullet ( .202 ) on my calipers , it is 1 3/8 over all and has a (U) with a dot in middle stamped on the base . Anyone know what this was called , who made the gun ?