The Sierra 120 grain Match King usually will shoot good in about any barrel. Popular powders are IMR8208XBR, CFE223, AR Comp, Accurate 2520 and TAC. I use CCI 450 primers and some forum members use Remington Magnum primers and match primers like BR4.
Id probably start with IMR8208XBR another bullet Id try is 107 SMK with 8208.
My Son in Law has a 22 Lothar Walther 1:9 twist 6.5 CSS and it shoots 129 grain SST accurately, I think he was using BLC2 but I cant remember for sure. Between work and three young sons he doesnt have time for reloading and shooting.
Id probably start with IMR8208XBR another bullet Id try is 107 SMK with 8208.
My Son in Law has a 22 Lothar Walther 1:9 twist 6.5 CSS and it shoots 129 grain SST accurately, I think he was using BLC2 but I cant remember for sure. Between work and three young sons he doesnt have time for reloading and shooting.

