Originally Posted By: TxhillbillyVarget isn't a very good powder for the Creedmoor and the heavier bullets. It will work with 120 gr and lighter bullets.
A big AMEN to this statement!
Lately, I tried R#26 with a cci 250 and fed 215 primer and the ultimate accuracy node was right at 2900 fps with my 8T, 24" barrel with a 140g ELD-X, 48.5g. Max load was 3050, 50g, with only the slightest bit of pressure which I would use on hunting up to 200 yards without a second thought. You have to work up loads for your rifle and components to see what is safe in your rifle, and I was using Hornady brass.
Great accuracy was achieved earlier with H4350 around 2750 with a 140g, but the R#26 is awesome.
Last week, I tried the R#26 in a new custom 6.5x55 with a 26" barrel. Safe max load in this rifle was 3150 fps with a 129g barnes long range, I will have to tweek the load for accuracy. The 129g Barnes long range I have found in several barrels to be a very easy bullet to tune for accuracy, certainly easier than the 120g Barnes tipped triple shock.
The loads I listed worked well in my rifle, but may not be safe in your gun, so start low and work up. I am looking for bug hole groups, and often will start with two shot groups when the wind is calm to get the general idea of what is going on with a new powder/bullet.