I am in the same boat trying to decide between the TBAC and Hyperion. I have 4 other cans but either way I will also be going with the 30 cal option to keep it flexible.
In my experience swapping a primer for an equivalent brand say going from a fed 210m to a cci br2 wont cause a significant safety issue but it definitely may change your load depending on how wide your node is and a bunch of other factors.
You'll want something with adjustable parallax to hunt that far. It can induce a significant amount of error. The 1-8 NX8 is fixed at 125 yards. I wouldn't shoot at an animal at 700 yards with fixed parallax at 125 but ymmv
First time big game hunting, so happy to be able to harvest an elk. He's no wall trophy just a goofy snag horn but I pulled off the shot at 600 yards with my 300 prc. First game animal I've ever tagged, and I was alone and no guide, my buddies showed up after they heard the shot. Hell of an...