Quote Originally Posted by stomp442 View Post
If the bullets in the green box don't shoot, you got a problem.

I keep going back to RL-17 because it gives me some incredible groups at 100 yards but it never holds up for me as range increases. At least that is the case in a couple of my 6.5s. My 6.5-284 when I had it would group in the low .2s at 100 but would struggle to hold MOA past 300 yards and I have experienced similar results in my .260AI. My .22-250 with 69 grainers and my .250 savages with 115s love the stuff though.
Ive had good results with the RL-17 but have a large stock of H4350 for a reason.

Quote Originally Posted by hcpyro13 View Post
Norma MRP Or H4831 and a 139 Lapua scenar. Can find starting points for load development in the manuals for a standard 260. I had a 28" barrel on my ack and found the 4350 a hair too fast burning. The 4831 or MRP with a case stuffed full enough to make ol' Scope Eye proud finally settled down my ES and SD to where I was happy.
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.