There really hasn't been a whole lot cartridge wise that hasn't been done before by someone wildcatting, maybe a little different flavor, slight cartridge design changes, belt / no-belt , improved shoulder, etc. Where we have improved is powders and bullet design and construction. Take for instance the Old Fred Barnes was making 180 grain cup and core 270 caliber round nose bullets way back when, B/C 372, sectional density is .335 and they shot around 2750 fps in a 270 Win. Some new bullets in the new Winchester cartridge that just came out different case, a larger case capacity and rifling twist for the most part. Our old loading writings in some cases show velocities above what some new loading manuals will show. Take some of Jack O'conners loads in a 270 Win pushing a 130 grain in excess of 3200 fps, 150's can push slightly over 3000 fps at your own risk of course. 300 Wby I know for a fact I can push a 180 grain slightly over 3300 fps in a 24 " bbl I would not recommend it, brass life is very short lived. I will not recommend anyone going over recommended current max loadings in any cartridge re-loading 101 work load up in a safe manner as per loading manual instructions. My point is comparing one cartridge over another cartridge or similar capacities and bore diameters is like comparing apples and oranges . There are cartridges out there that kill above their weight and they kick a lot less. Shoot a lot, be proficient with your gun, choose a good bullet, shoot cartridge/gun combo what you like and be a happy camper. This non sense of one is better than the other is only someones opinion.