I have a Remington 700 243 from the late 1960's. I put a Bushnell Banner scope on it. Seems from what I am reading here it is totally different than vortex.
On the Bushnell based on a 27 inch deer's chest to establish a range You crank the turret to the distance so the aim is dead on.
The scope came with several wheels for established loads of the day. There were also a couple of blank wheels for hand loaders to use. With the hand load you desire sight in at 100yds as a base, then at 50yard increments out to 500 yards and mark each on the wheel.
No it isn't perfect and can not be used in a hurried event but does work very well for what it is.

Al