I talked to my mechanic about the 250 vs 300 gear ratio. He said they are different. Also not sure you knew the diameter of the powertech props are 15.25" and the Rev 4's are 14 5/8". Which is why PT recomended that I try a 16 pitch. They sent 17's by mistake. That works out fine since I wanted to see if the PT 17 would give me a 5600rpm at WOT. I run light most of the time and they may give me better cruising speed. Hopefully the weather will work out this week like they say and I'll get to try them out.