Those round nose bullets don't give up much, especially accuracy. My Nosler M21 308 Win with a 220 gr Sierra RN at 2444 fps went 1.5" at 250 yards.
JD338
I blew the dust off the 700 Classic 35 Whelen and did a load work up with CFE223 as an alternative to RL15 and the Sierra 225 gr Game King. I got good velocity from the 22" barrel and the 100 yards group went .475".
JD338