RE: 1,000 yard deer rifle...
When sighted in at 100 yards, this load in my rifle would be about 215 inches low at 1,000 yards. And the 10 MPH wind drift would be 67 inches. This is at sea level. At 7,000 feet in elevation, the 1K yard drop is "only" 185 inches.
I'm in complete agreement that a rig like this can produce some amazing groups at long range. A guy in North Carolina set a world record with a heavyweight 6MM-284 a few years back using the 107 Sierra bullet. Just under three inches for ten shots, if I remember. I'm only questioning the amount of "pop" a bullet of this weight still has at this distance - particularly when its impact velocity is below 2,000 fps.