180 to 250(+) grain .358" bullets being launched from a standard (.30-06) length action, at velocities of 2,800 to 2,400 fps.
.35 Whelen started life as a wildcat. .30-03 (the longer-necked father of .30-06) was necked up to .35 caliber, at that was it. Then, in 1988(?), Remington began producing rifles and ammunition for the cartridge. As such, .35 Whelen became a standardized cartridge, and found its way into the hearts of many people that had never heard of it in its wildcat form.
Factory ammunition offerings are slim, but the possibilities are nearly limitless, if you hand load. Component brass can be purchased from Remington, or formed from .270 and .280 cases. (.30-06 works, but is not ideal. The .270, .280, and .35 Whelen all share a .30-03 heritage, so forming from .30-06 results in a short neck.) Most .35 Whelen reloading die sets come with a tapered expander in the sizing die, so no forming dies are required.
Though some .35 Whelen owners complain of punishing recoil, I'd be willing to bet you would find it more manageable than the 7mm Rem Mag.
If you reload, you'll love it. If you don't, it's still a great cartridge; but its light may not shine as brightly.