RL26 seems more dense to me. Running it in my 338 and 35 Newton with excellent speeds. I couldnt get enough 25 in either of those to get the same speeds and accuracy so far.
A few of the fellas in my group decided to try it in their 30-06's with 200 grain Accubonds. I thought the same at first, they'll never get enough in there. Sure enough, I was schooled. They got good loads in them and also very good speeds.
For me, at least in the 338 Win and 35 Newton, 26 really didn't tighten up till I was towards the top end of the loads. Once I was there it has acted very consistent. YMMV.
