preliminary tests of JSB exact jumbo rs 13.43 are…

very promising indeed. I fired them from my .22 BSA scorpion that has been on a strict diet of 16.0 gr. exacts. It put the 13.43’s hole in hole and I shot 5 shot groups of five and the biggest was 1/4″. I will post crony results soon as well as pictures of groups. They surely were moving much faster than the 16.0 grainers, but they were subsonic. Crony results will follow this week. THUMBS UP FOR SURE! 8)