Your question is vague and I sense you are struggling to spend on another rifle that may see very little use, so you want dual purpose. I think your comment, "I cannot seem to get over the hump of purchasing a gun exclusively for long range shooting without being able to use it for hunting." says it all.
You can have both in one rifle as long as it's accurized for 1000+yds shooting, however, I lean to having a hunting rifle in a larger cartridge (your 280) and a practice rifle in a smaller, light recoiling cartridge. My suggestion is you already own a cartridge capable of hunting, so buy an accurized practice/varmint rifle with an expensive barrel, not an off-the-shelf rifle. It will build confidence in your long range shooting.
1) a heavier barrel helps cooling for multiple target shots or prairie dog hunts.
2) a smaller cartridge like a 6ARC, 6GT, 6PPC is more enjoyable (and cheaper) to shoot multiple times for practice shooting at ranges over 1000yds.
3) a Bartlein, Douglas, Krueger, etc. premium barrel will increase accuracy
4) a premium trigger from Trigger Tech, etc will increase accuracy.
5) a premium stock/chassis will improve accuracy.
6) a custom action will increase accuracy
I'd recommend you build or buy a custom practice/varmint rifle since you already own a 280.