Ive had good results with the RL-17 but have a large stock of H4350 for a reason.
Ive played with just about every powder you can run in a 260...in a short free bore barrel RL-17 RL-19 H100v and H4350 are top of the pack...in a long free bore barrel RL-19 RL-22 RL-25 and as you said MRP are top for velocity vs pressure....ive never gotten the velocities i want before hitting pressure issues with H4831sc or IMR 7828ssc and IMR 4831 is very accurate but falls way short on velocity.H4350 is the most used powder in a lot of cartrages because its simple to make accurate but even with a 30" barrel a 45g charge in a 260 is only burning 98%.... I was playing with numbers on quick load last night and from 45deg to 85deg H4350 showed a 57fps difference...100V showed a 47fps difference and RL-17 showed 33fps difference. I know quick load is not the end all do all of loading but its been VERY accurate for me...im working up loads in one of my 260s with all 3 of these powders and will keep track of summer velocities and compare them this winter.
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