I only shoot the 147eldm in my 6.5creeds. in my 29 inch match barrels I can get to 2975fps. That's the highest node I can reach. It's hard on brass in the summer at that speed. I run my match guns on h4350 at 2850fps now and it's better for me. My match guns have long free bore and bore rider throats I can do a little more with them. If you want the best Creed do a Tikka and use the long bolt stop and the long magbox. Then give it the proper free bore for the bullet you want to shoot. Even the 147s will fit that magazine seated real long. I run the boat tails junction up in the neck a little. This gives you room for full powder charges of rl26 and every 24 inch barrel I've built has easily done over 2900 fps with zero pressure signs.
I'm playing with the super Creed mods to see if I can get the little guy over 3000 fps and have brass life. I'm pretty sure it will.
Super Creed is just a deeper Creed chamber and then run 260 brass in it. When the 260 brass fire forms in the Creed chamber it now has the straighter sides and the 30 degree shoulder and will hold more powder than both. It still uses your original Creed dies just set up higher in the press. I'm doing mine by running a 260 brass in the die and pushing the top of the shoulder back a little to give it the same neck length as the Creed and then just fire form them.. Since they headspace on the new shoulder I started fire forming is simple. This mod works great for the Tikkas because you can still fit a long magazine with the longer brass. In a regular short action I don't think there is much to gain because of length restrictions. Of course in my single shot match guns they will be no problem. I don't have all the data done yet. But will start a new thread when I do. I'm just going to call it the Super Creed for now.
This is not my ideal but I am doing it different so that I can keep the same neck length. Someone ran the reamer so that the regular 260 fit and then fire formed it from there. But basically that just gives you an almost 260ai. And the neck is way too short for the Creed reamer. I know the 147s are going to be over 3000 with rl26 and 24 inch barrel. Fun stuff.
Shep