Re: Triple X -help
According to the barnes manual, IMR starting loads for 4064 is 43.5 @2491 fps MAX is 47.5 @ 2720
IMR 4320 starting is 44.0 @2421 MAX is 48.0 @ 2641 fps.
If you wish to use an H powder try H4350 starting at 50.5 @2532 and MAX @ 54.5 @2733 fps.
Remember, these are book listings, I would start even lower. For your 22" tube probably the IMR powders would do best. For less temprature sensitive powders, try the H powders.
Also 200 primer will do fine. If hunting in extreme cold, maybe give the 250's a try.
Long range shooting is a process that ends with a result. Once you start to focus on the result (where the shot goes, how big the group is, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.