Yep, what Tech said.
I use a Leupold rangefinder and have it on the TBR (True Balistic Range) setting with the ballistic program set to my rifle subgroup. Its as easy as Range, Dial, Shoot. For distances under 300m on big game I usually don't bother referencing a dope card as I can pretty accurately dial in the required range, but having a dope card for distances beyond 300m becomes a little more essential.
Once you get used to them they give you great confidence in your rifle and your ability to put game down cleanly at distance. Enjoy!
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