need some thinkers, please help

[Bobby B.]

Recently, I completed my semi-custom 7RM. For a scope, I purchased a Swarovski 4-12x50 with Ballistic Turret. Through the use of color coded elevation rings, it's possible to set up 4 "zero marks". For further explanation, visit their website.

I'm zeroed at 200 with the crosshairs, 300 with the first color coded ring and now want to zero for the next two color coded rings. Unfortunately, the range at Spruce Grove where I'm a member is limited to 300 yds.

Each click of my scope equates to 1/4 adjustments. According to my Ballistic Chart (thanks Dick284), assuming a 200 yd zero, the bullet drop is -11.6" at 350 and -18.2" at 400. According to my reasoning, if 1 click is 1/4" at 100 then 4 clicks are 1" at 100, 4 clicks are 2" at 200 and 4 clicks are 4" at 400. Therefore, if my bullet drop is -11.6" at 350, 13 clicks should equate to 11.38" at 350 yds. Also, 18 clicks should equate to 18" at 400 yds.

Have I calculated correctly?

Bobby B.

[270WIN]

Your math, and the logic it's based on, look right to me. I'd be interested in knowing how close it all checks out at the range.

[Pathfinder76]

Click in minutes not inches. That Swarovski should be set up with minutes and a decent ballistics calculator should indicate minutes as well.

[hunt_and_fish]

One minute equates to pretty close to an inch at 100 yards so Bobby's math is still in the right ball park. However, I definitely wouldn't trust the clicks without shooting at those distances. I suggest finding a gravel pit or a buddy's field (where safe) to do some target practice at the distances you'd like to set the remaining two zero marks at.

[Dick284]

Bobby:
Just drop the coin for a Genasee Range membership, you'll have all the distance you need to confirm your apparently flawless math.

http://www.chas.ab.ca/ranges.html