Re: 300 RUM with 200 gr. Nosler accubonds @ 3200 fps is it possible?
I get 3146 FPS with the 200 AB in a 27.25" 12x barrel. I also have a bench rest tight neck chamber. With a factory SAAMI chamber, 3200 FPS is attainable even for a 26" tube.
I shot a 55" bull moose last year with that load at 650 yards. It was pure he!! on that bull. It will easily harvest elk and moose out to 800 yards cleanly.
Yes RL-25 and retumbo are about the best for the 300 RUM. Mine really shines with RL-25. This load has given me as good as 5/8" at 300 yards and none over 1" at 300 yards.
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.