For context, here is my experience and preferences for hunting whitetail. I grew up using .30 caliber rifles for deer hunting. I have a sweet spot for grandpa's old .300 Savage model 99. A few years ago I got a .243 after shoulder surgery for a lighter carrying and recoiling rifle. I love the results I get with the 100 grain bullet. Most recently, I used a 147gr .300 Blackout from a 10.5" pistol. That is the tree stand gun. Shots are under 60 yards. I have taken a small deer at 70 yards, broadside, with a 64 grain .223. It worked, but I want better penetration and a more durable bullet.
So now I am interested in the effectiveness of the 6.5 grendel from a 20" barrel. I would like a cartridge that performs well out to 200 yards. What are your experiences with this round on Michigan whitetail?
Any input on AR upper options is appreciated too.