I was shooting the 250 gr. Hornady's. Speed was 2880 through the chronograph. Yes, it was a thumper. I shot several elk with it and it was effective, but I was not sufficiently impressed that it killed them any deader or faster than any other rifle when shots were well placed.
That one started as a .300 Jarrett and was rebarreled after being shot out. That was the most impressive elk killer I've used. It was pushing 200 gr. Accubonds at 3020 fps, and had heavy recoil as well.
Still, it was more gun than necessary unless it was going to be used somewhere way beyond 500 yards, and that opportunity never came up. Except for one, all my elk have been within 300 yards, and almost all less than 200. The two longest were around 400 and 500 yards, and I took them with an '06 and 180 gr. bullets. It did the job nicely.