dadx
05-30-2000, 09:26 PM
Just installed a new Cobra sight.
Whats the most effective way to use this thing? Holding it at home, I find that I'm inclined to hold my head close to stock, cocked over so that I'm sighting with my left eye (I'm holding the rifle with my right).
A question on ballistics. For line of sight 1.5 inches above line of fire, a Federal ballistics chart shows that point-of-impact (POI) at 50 yards will be +1.9 inches above line-of-sight, at 100 yards +3.5 inches above line-of-sight. This is for a rifle zeroed at 200 yards.
Now, the Cobra sits about 3 inches above the line-of-fire, unlike the iron sights which are about 1.5 inches.
Without having access to a ballistics program it seems to me I can take the following approach.
At 50 yards, the POI is 1.9 inches above the line-of-sight. However, the Cobra line-of-sight is another 1.5 inches above the iron line-of-sight. Therefore, using the Cobra, the POI at 50 yards should be +0.4 inches above the line of sight, etc.
Is this a valid way to procede, or have I missed something?
Whats the most effective way to use this thing? Holding it at home, I find that I'm inclined to hold my head close to stock, cocked over so that I'm sighting with my left eye (I'm holding the rifle with my right).
A question on ballistics. For line of sight 1.5 inches above line of fire, a Federal ballistics chart shows that point-of-impact (POI) at 50 yards will be +1.9 inches above line-of-sight, at 100 yards +3.5 inches above line-of-sight. This is for a rifle zeroed at 200 yards.
Now, the Cobra sits about 3 inches above the line-of-fire, unlike the iron sights which are about 1.5 inches.
Without having access to a ballistics program it seems to me I can take the following approach.
At 50 yards, the POI is 1.9 inches above the line-of-sight. However, the Cobra line-of-sight is another 1.5 inches above the iron line-of-sight. Therefore, using the Cobra, the POI at 50 yards should be +0.4 inches above the line of sight, etc.
Is this a valid way to procede, or have I missed something?