I have found that RL-22 gave the best accuracy with the 75gr a-max and that H4831SC gave the best velocity and the best season to season velocity spread so I could run one load and still great accuracy. I have found that the .220 AI is one easy round to load for and seems to be accurate with every powder I tried with the 75gr A-max. Never tried anything lighter since it shot those scarry accurate.
Enjoy its a fun cartridge. Let us know how those TSX do even thought Iam not able to hunt with anything under .243 dia I have always wondered how well it would work.
