My original plan on a 6.5 build was going to be 6.5-06 , I had know plan on building a 6.5 Creed. I picked up a Long Action Savage for the 6.5-06 .
I have QL and decided to run numbers on the 6.5 cartridges, I saw that RL26 seemed to look pretty good for a lot of the 6.5's and the 6.5 Creedmoor looked like a good choice based of possible velocity vs powder charge. With the long action I could seat long and gain some case capacity. I hadn't done any research into the Creed beyond availability of brass. I decided to pick up a 26" X-Caliber barrel and begin the real world testing to see how it compared to QL calculations.
My findings seemed to show QL was quite accurate in it's estimations and my results were as follows:
Brass Nosler 52.7 gr H2O, BR2 Primers, RL26 powder and COAL ran toward the 2.890" some a bit less and some a bit more.
I loaded for the best SD and tightest groups at highest safe pressure, Pressures predicted by QL. 63K max.
130 ELD-M 3050 fps
140 ELD-M 2990 fps
143 ELD-X 2998 fps
147 ELD-M 2930 fps
I was able to get higher velocities with most if I ran them to max Pressure of 63K but accuracy fell off. Also testing with 143 ELD-X bullets I was able to get 3054 fps with no sign of pressure even though QL showed the pressure with that velocity was quite a bit over pressure, my lot of powder was hotter than what was in QL data so I made the adjustments to BA to equal velocities I was seeing.
I have also since original testing switched to HBN coating, had to increase powder charge slightly to get back to the node. I have about 1000 rounds at those velocities down that barrel now and over 10 loadings with some of the Nosler Brass with no sign of problems with brass. I do anneal my case necks.
I never read any of the 6.5 Creed hype until after I began testing myself. Funny thing is most of the hype is centered around loads that are quite a bit slower than what I shoot. As far as 147 ELD-M bullets at 3000 fps, it can be done with HBN coated seated long and 28" tube. I couldn't comment on how it would shoot, but pressures should be within its designed pressure. Now a 30" barrel well I would be pretty confident in a load shooting well at 3000 fps. My 26" has no problem of hitting 2950+ fps but accuracy falls off, being a Creednoor though just the vortex created by the extra speed may kill and gut the animal even with a miss.
I have run the numbers on the Swedish 6.5x55 and with RL26 or MRP2 you could out do the Creed by about 30 fps if you load it long and run pressures to 63K in a modern action made to take it. Don't plan on smoking it unless you are using a 6.5-284, 6.5-06 or larger then you can add a good 100 fps. For some reason the RL26 does not show to increase the Swed as much as the Creed.
I have also purchased a Savage 10BA stealth in 6.6 Creed because of my results with the build, it seems to be quite accurate and velocities run about 50 fps an average slower with the 24" barrel.
I really like the Creed and I have always been a 30-06 die hard, I ran the numbers on the 06 using heavy 200 bullets and RL26 they look promising.