When I got my 260 everybody told me I must use H4350 and try to get 2900 fps out of 130 gr bullets. Finally a kind man on this site encouraged me to try H4831/140s and not get greedy on velocity. Best thing I did.
Good to know.
I've been thinking about trying 143Eldx and 140vld in my LR260 (gas gun).
I have a metric sh!t ton of H4831sc and none of my present barrels are using it. I may have to try it ( I have an adjustable gas block, so life is good).
I am quite a velocity hog though