Thanks for the additional info on calibers fuzzybear.
I'll most likely start with something I already own like the 22-250 and .243. We (actually my husband ) also have a 25-06, 30-06, and 7mm rem mag among others. Come spring I'll play with all of them and see which ones are able to reach out there. I know his 30-06 is an Ackley improved with lots of customization and extremely accurate, just don't know if its capable of distances of even 500 yards let alone 1000.
We shoot a lot of factory loads, but also reload. My husband gets a kick out of fine tuning loads for specific uses and rifles.
In the meantime I'll keep my eyes open for some used bargains in the preferable calibers.