I am a dyed-in-the-wool 7mm fanatic. I have owned/shot all but four of the 7mm cartridges. No experience with 7x57, 7 RUM, 7 STW or 28 Nosler. I would suggest 7 Wby as I have extensive hunting & load work with mine. My maximum self-imposed hunting range is 600 yards. None of my barrels exceed 24". 7 RSAUM Just now getting started with load work on a brand new rifle. It is the match for my 280 AI & if the RSAUM meets the accuracy/velocity level of my AI, the AI may begin to collect dust. 7 Weatherby - My favorite Took an Elk with a 140 @ 3400 fps but mostly hunt with a 3000 fps load for lesser animals. Taken many Axis with 150's @ 3250. 300 WSM - Ballistic twin of the 7 Wby Took a Red Stag & a Pronghorn Antelope (overkill) with a 165 Accubond. I am currently running 155 Scenar's & am in love with terminal performance as well as accuracy & downrange ballistics.