in my experience, 25-06's can be fairly finicky when it comes to ammo. While this can be true of certain rifles in dang near ANY caliber, it seems to exemplify itself in the 25-06 more often than not.
Sorry to hear that has been your experience with the 25-06 caliber but you are the "ONLY" person I have ever heard claim that the 25-06 caliber has some kind of inherent accuracy issues. I have never found it to be the case that 25-06 rifles are more finicky about what they will shoot accurately. Are some cartridges inherently more accurate than others? Yeah, so some saybut we are talking increments of "better" that only a benchrest tournament shooter would care about. Ifgun experts madea list ofall the things that could affect the accuracy of a rifle and listed them from most important down to least important, cartridge type and design would benear the bottom ofthat list and completely overshadowed by a dozen or more other rifle related issues. I have a Tikka T-3 in 25-06 that shoots everything I have fed it very well and some things amazingly well. It will consistently shoot Federal Sierra Gamekings or Hornady Interlocks into sub 1 inch groups at 100 yards. And this rifle is certainly not the exception in 25-06 that I have encountered. I have shot many accurate 25-06 rifles. Enough tosay confidentlythat if you encounter one that isn't a shooter it's the gun and not the caliber.