John,
I've been using 47.8 gr RL-26 in my 22" .260 with Lapua brass, 200's and 147 ELD's at 2,770 fps.
I reluctantly switched from H4350 when it became hard to find.
17 was great until the temps started to climb.
Can't say I'd wanna switch back at this point as 26 has proven to be rather temp stable.