Now my Ruger 77 250/3000 shoots the same weight bullets at 3000 FPS
I'd like to know a bit more about your Ruger ... barrel length, especially ... and I'd like to know the specifics of your load : bullet, powder, primer, case brand, about the chronograph you used to determine velocity, and whether your load has been pressure-tested. I'm not intending to call your integrity into question, it just doesn't make a lot of sense that this could be achieved without exceeding SAAMI pressure standards.
I'm a .257 Roberts fan, but it can be a bit of a pain in the ass in a short action. My current .257's chamber calls for about a 2.9" OAL with sharply pointed bullets but 2.82" is the most the magazine allows so I have more jump than I like. I've considered rebarreling to .25 Souper or .250 Savage AI, but more likely if I ever do another .25 caliber it will be on a long action (.25-'06) or magnum (.257 Weatherby). I have other options like .308 that work better in a short action.
Tom
