if your seeing extractor marks at 41 gr , I don't think I'd try 42 grains . I made a reduced load for a axis in 308 for a young shooter . I was impressed with how well it shot .
this is my 43 grain IMR4064 with a 139BTSP . I was checking bullet drop at 300 yds .
tikka @ 200
the top three spots are my remington . RL17 powder with a 140 Berger VLD hunting @200yds . left 48.0 gr . center 48.5 gr . right 49.0 gr
49.0 target .