Both really need a med or long action to get there full potential.
I easily reached 3000 fps with the 156 EOL and H1000 as well. Now I need to preface this with the fact I have a medium action and a long throat allowing me to set the bullet out such that the base is near the neck shoulder junction. This gives my rifle a little more room pressure wise so I can run 58.2gr with zero pressure signs. I've shot up to 58.4gr and had no pressure signs but stopped as I reached +3000 fps.I wouldn't think so. With the 156, I know Jeff Brozovich was getting like 3000 fps or so with N565, and many people I have seen on here are getting 2950-3020 out of a 6.5x284 with the same 156 and RL26. seems like both are nearly identical performance. Stick with what ya got, the 6.5x284 is about the best non wildcat 6.5 that is not terribly overbore. The 6.5 PRC just does it in a short to mid length action.
I agree The PRC will do nothing the 284 will not do but like you said the availability of factory ammo is the only advantage I can seeI think the advantage of the 6.5PRC over the 6.5x284 is the availability of factory ammo(and potentially factory rifles). An experienced hand-loader will not be able to distinguish a difference from a ballistic/performance, accuracy, barrel/case life, feeding, etc. standpoint. Most differences noted between the two cartridges will likely be due to the specific barrel/rifle which can occur with either cartridge. Case capacity between the two is identical. Originally touted as a short action round, which would have had strong appeal to many, the 6.5 PRC requires greater action length(or magazine/feeding modifications) to extract full use of the case capacity with +140gr bullets, diminishing any advantage to the long action typically used with the 6.5x284. The softer aspects of case design, so called "inherent accuracy", popularity, glamour, etc. between the two cartridges will likely be debated forever. IMO.
I have lapua brass for my 6.5x284Which one has Lapua brass ?
The Hornady brass has been great for me. My rifle is turning in .3-.4 MOA with the 156 EOL at 3000 fps.I shoot both and it's true, the x284 will match the PRC, but only with the long action. The PRC has pushed the 6.5x284 off the top of the hill for me. I am strictly hunting with mine so Hornady brass has been fine. It may be a few years, but LAPUA will come around. Till then I'll keep on not noticing.