Yeah...Ive got the same Ruger #1A and it was liking 19.5 gr. 4198 and that Hornady 55 seated out a bit, must have a throat on that gun...
Anyway it shot an inch with that load and FWIW when I tried a 55NBT and a max charge of CFE223 it really liked that!
Killed pigs and javelina and coyotes and such with the little Ruger
