You may have a hard time getting a load compressed much over 106% with RL26.
The BA seems to be a bit more than QL has it listed for so you may get close to 3000 FPS with a charge close to 106% (my lot # 08014Y050115 of RL26 showed a BA of closer to 0.3558 rather than the default of 0.3397) with my lot at 106% fill it would be 2988 fps at 55,906 psi. with 64.1 gr. and my 06 allows for seating out to 3.390", by seating longer using 106% fill 65.1 gr. it would be 3014 fps at 57,178 psi. all from a 24" tube.
It shows real promise with with heavy bullets like 208 ELD-M in the 06, I am going to give them a try sometime. Using 208 ELD-M HBN coated , Coal of 3.390" a case fill of 105.4 PSI of 59,145 QL shows with my lot of RL26 I could potentially get 2750 fps. that would make the 06 capable of 1 mile shots if accuracy was good at that speed with U79.7 moa and would still be supersonic at 1500 yards, again out of a 24" tube.