Lots of good comments. I suggest you clearly define what you're wanting.
What's your budget?
What game are you targeting, Whitetail deer or Grizzly. .260 is nice for deer, under powered for the Grizz.
A 5lb. Mountain rifle or a heavy barreled sandbag blind gun. Both are hunting rifles.
What barrel manufacturer do you want. Most factory barrels are forged (good and cheaper to make). Custom barrels are either carbide button or single cut. Both produce much smoother and consistent rifling but cost more.
Barrel twist depends on your caliber and planned bullet weight.
The model 7 is a great choice as you already have it. However, many times you (gunsmith) spends a lot of time trying/squaring the action threads/lugs and a true custom action is already nearly perfect, just pricey.
22" will work but 24" is better and 26" has advantages if you really stress the long range part.
Stock, McMillan or similar fiberglass stock glass and pillar bedded. Free float the barrel.
Trigger should be adjusted to be clean/crisp. Again, a smith can do that on the Remington but there are a lot of drop in triggers that offer easy adjustability if you want a different pull later on.
Scope mounts, height and weight all to be considered based upon glass. And the glass generally will cost as much as the gun. Don't go cheap. Zeiss/Swarovski/Kahles/Leupold are brands that off high end glass.
Read a lot of long range hunting forums to see what others are using for 1000 yard shooting.
Good luck and let us know where you end up.