Author Topic: trouble shooting (Read 450 times)

gilly · « **on:** December 29, 2003, 01:00:29 PM »

today i finished zeroing my brothers scope in my basement. Its zeroed at 15 ft. then i went to my freinds backyard and I shot at his target, the target was about 25 ft away and the pellet shot high. I mean it went about 1in high, what is wrong with it and is this normal.

dave · « **Reply #1 on:** December 29, 2003, 01:32:55 PM »

Thats normal. Just because you zeroed the scope at 15 feet doesn't mean it will have the same impact point at 25. Setting the scope at that close of a range usually means the pellet trajectory is still rising at 25 feet, so the POI will of course be higher. Or, you could have just shot a bit high?

gilly · « **Reply #2 on:** January 02, 2004, 06:18:49 AM »

i wasnt shooting high at all i tried agin today but the same thing. but right know its a little windy and cant relly get a good zero. but im still plinking in my garage.

DeeGee · « **Reply #3 on:** January 02, 2004, 07:05:56 AM »

Gilly:
Get yourself a free download of a ballistics program. These programs will give you a graph and additionl data showing the actul flight of your pellet.
You'll need the caliber, weight, and BC of your pellet, as wll as the actual muzzel velocity of the pellet. These programs are self explanitory and usually quite good.

Off the top of my head, the Crosman Premier .177 pellet, 7.9 gr., has a BC (bullet coefficient) of .019

DeeGee