Budget is the biggest factor in optics. You get what you pay for, especially in hunting conditions of low-light and weather. How much are you willing to spend?
I like low power options. Maybe look into a 1-6X or something like that. They are available in all the price points because they became favorites with the tactical competition crowd.
Do not use a Trijicon ACOG Reflex. I used one for a .300 Blackout rifle on a whitetail hunt in Texas. I didn't have my shot until the end of the day in the fading light. I could see the deer UNTIL I looked through the sight. The glass took away what little light I had left and all I could see was the amber triangle. I had to raise and lower the rifle several times until I was sure that I was going to put that amber triangle where the deer WAS before I raised the rifle. It worked, and the Nosler 125-gr Ballistic Tip did its thing.
The next trip I used my M14 with the peep sights. Ha!