Seems like RL 26 might work good with the heavier bullets in the 284. But, I'm definitely not an expert on powders....maybe someone else can chime in? I won't be hitting the range for another few months though, so I won't have any personal data until then. From what I have been reading, people are getting nice results with 26 in calibers other than what it is advertised for. I'm looking forward to giving it a shot.
I can say that another cow elk fell to the 145 LRX this morning. Double lung shot at 250-300 yds. She was on the move with the rest of the herd, continued about 30 yds after she was hit and then crashed. Complete pass through, golf ball size exit.