Redfield scope c/w range finder ?

Just picked up an old BLR in 358 Win. wearing a Redfield 2x7 scope.
 It has an interesting range scale and extra pair of crosswires above the normal crosshair. The range scale shows a vertical row of numbers from 200 - 600 on two power that descends to 600 when the power is increased to 7x.
 
 Anyone familiar with this setup that might be able to explain how the system works ......or doesn't ?

I think what you have is a Redfield with their 'accu-range' system. Two crosswires at the top of the field, and a list of ranges at the bottom?
 You put the animal you want to range between the top two wires, and dial the power until the wires touch the top and bottom of, say a deer's chest. Then read the range at the bottom.
 The top two wires are supposed to let you get the range if the object measures 18 inches- the supposed average deer's chest size.
 Assuming the animal, or some part of it, measures 18 inches, and the animal is still long enough for you to dial the power, it probably works.
 I had a 3x9 with that set up years ago. Found it more trouble than it was worth. These days, with superbly accurate lasers available.....

Thanks Jack
 Same system basically as the Leupold. I've owned several Redfields in the past, and never run into one of these , til now.
 
 I agree with you about the lazers. Now that I have the LRF1200 it's hard to imagine going hunting without it.

Canon, I have owned several of these scopes over the years and they can best be described as "ok" with a few exceptions. I still have an older 3x9 Redfield, Widefield, Accu-trac that is the best of the lot I have owned.
 The Accu-trac feature is extremly accurate on this particular scope with a 30-06, 180gr Sierra Game King.
 With a 200yd. zero it is very accurate out to 500 yds. (This has been proven, time and again, by the use of a 5 gallon paint bucket set "randomly" anywhere on the range. )
 This, of course, is taking all the time in the world to dial it in, while shooting from the bench.
 The "Range Finding" capabilities of these scopes, IMHO, can best be rated as "OK" because of better technology available today. However, even their outdated method still beats my "guesstimation" when range is important.
 The "Accu-trac" function is as good as most in returning to zero after twirling them around a bit. I have not seen this feature advertised in some time now.
 Also, it is important to remember that game animals DO NOT come in exacting sizes, ie. 18" top of back to bottom of stomach, or 42" top of back to the ground, etc, etc,.
 All-in-all, Redfield still makes a pretty good low end scope by about anyones standard.
 Just my thoughts, Respectfully, Russ