10.9gr of 1680 under a 220 Matchking is well known as a good subsonic load. In 2 different AR's I found it was more accurate at the mag length of 2.24", rather than 2.08". It shot okay in a CMMG, and very well in a Daniel Defense.
One member reported the Lehigh Defense 194gr bullet worked well on game at subsonic speeds.
I just had some 240 Matchkings show up, and plan to try them as well.
I'm planning to try some loads with Lil'Gun in supersonic loads, with both 110gr TTSX, and 125gr Ballistic Tips.
