Re: 1000+ yard deer hunting
If I were having a custom rifle built for deer only, I'd definitely have Kirby build me a 7mm Allen Magnum and shoot the heaviest-highest BC bullet I could find.
Off the shelf, a 300Rum is a pretty nice rifle for deer.
If some is good and more is better, then too much is just right.
My mind is a raging torrent, flooded with rivulets of thought, cascading into a waterfall of creative alternatives