Estimating Range w/Duplex Reticle?
Hello! I currently have a Bushnell Legend 4-12x40 mounted on my rifle. Unfortunately, the scope has a duplex reticle and not a Mil Dot. Is there any way for me to estimate ranges with a duplex reticle? No documentation on this topic was included with the scope. Thanks for any help!!
Here's the scope: http://www.opticsplanet.net/bushnell-4-12x40-legend-riflescope.html
Yes, there is a way. Here's how it works. First, you need to know how big something you are wanting to range is. For example, lets take a deer. The average deer will be about 18 inches from brisket to the top of the back. Take something that you know is 18 inches tall & put it at 100 yards. Adjust your scope magnification so that the target is bracketed between the center cross hair & the spot where the reticle leg changes size or, if the target is too big for that, it is bracketed between the crosshair and the bottom of the field of view. Let's say your magnification reading is 5. Now, do the same thing for two hundred yards. Say your magnification reading is 8. Same thing at three hundred yards. Say your reading is 11.
You can now bracket a deer in the wild & look at your magnification reading. Say it is 9 & 1/2. You know that if it was at 200 yards, the reading would be 8. At 300 it would be 11. Since it is halfway between 8 & 11, the deer is half way between 200 & 300 yards. Your deer is at 250 yds.
This method is a little confusing at first but it is not as complicated as trying to learn the mil dot.
By the way, the average human just happens to be about 18 inches from belt to neck.
There is a much simpler way to set up your rig. It is called "point blank range". The way it works is this. You zero your rifle at a set yardage then figure the drop. Say that you are hunting deer so if you aim exactly halfway down the deer (from top of back to brisket), the bullet can hit anywhere from 5 inches high to 5 inches low & still be in the heart/lung area. Let's suppose you are using a 303 Win Mag with a 180 grain bullet at 2800 fps. using the ballistics charts, you can zero your rifle at 292 yards & your bullet will not be over 5 inches high or over 5 inches low anywhere from the muzzle out to 345 yds. Put your 18 inch target out at 345 yards & turn you magnification ring to bracket it. Look at your magnification reading. Say it is 10. You now know that if you bracket a deer & the magnification reading is 10 or less, the deer is within point blank range. Just aim at the center of the vitals & squeeze the reigger. No more figuring. Very fast.
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