Rick, adjust your scope on max magnification. By "adjust" I mean stand up, with the scope loose in the rings, then pull it back till you get a full view, and continue pulling back till the scope starts to turn black. Then you have discovered how much play you have in your "eye box", I will put it in the middle.
Adjusting your scope for full view may be different for some people from sitting on the bench vs standing due to head position on the stock.
Scopes that distort at total magnification are usually poor-quality scopes or they are not adjusted properly, to begin with. I will not mention brands, but some that are popular, are not good at all at high power, indicating poor lens quality and poor lens coating. Most of us live on a budget and have to learn to adapt to our budget.
When we hunted in Kansas, they had a 10-day rifle season, that was it. Bucks were large with 200 lbs being the smaller versions we saw. Bucks were fighting all the time, and they were breaking off their brow tines. You do not want to shoot a buck with broke-off brow tines if you are wanting a trophy.
So, we wanted to rattle in and use bleat calls to get bucks in the best we could, but those large bucks would often hang up at 500 or more yards. We learned in a hurry that you need enough scope power to see if the brow tines had been broken off...I made that mistake once on a 280 lb buck. Brother shot an old buck at 550 yards that weighed 360 lbs that did not have brow tines from age, but his spread is tremendous, a fully mature buck, past his prime.
6x to 24x is my favorite for this kind of open country hunting, and my longest shot would be in the 600 yard range. We did practice out to 600 yards to know our equipment, where 7 Rem Mags rock.