My "short list" for 1,000 yard deer rifles would start with the .300 RUM, Win & Weatherby. For a lighter round, the .270 WSM is fast enough to be forgiving. Then I would get realistic & say for retained energy at 900-1,000 yards you should be considering a .338, rum or Lapua, or the .338/.378 Weatherby.
I recently picked up a used Weatherby Accumark in 338/378 and was pleasantly surprised to find the recoil negligible with the standard muzzle brake
, that the rifle isn't too heavy to cary on most hunts, and that mandatory ear protection was the only negative for a true long-range outfit. If you don't like recoil, you would love this rifle. The felt recoil is similar to a mid-weight 20 gauge shotgun with a light
The most uncomfortable recoil rifle I own is a .270 WSM, so don't assume the light rounds always feel better to shoot. That .270 WSM is hard to shoot, and harder to shoot well.