I had a 25P that Mark pitched to 26, Even though they run stiff, I was still on the limiter at 78-79. It drove great and had a good holeshot when dual pvs holes were drilled. From the Merc site....
EXPANDED PITCH RANGE FOR MERCURY RACING REVOLUTION 4 XP PROPELLER
Mercury Racing® has expanded the pitch range of its popular Revolution® 4 XP propeller line, investing in a new base casting that will be used to produce this high-performance prop in a 15-inch diameter and pitches of 26.0, 26.5, 27.0 and 27.5 inches. This new casting will be used to replace the current 14.63-inch diameter Revolution 4 XP at 26.0- and 26.5-inch pitch sizes.