Originally Posted by Jon A
As has been mentioned, biggest things to check: Click value of scope, 100 yd zero and velocity.
However, before any of that answer this--how was the distance to the gongs measured? If a rangefinder gives you the range of the hillside or bush behind the gong, you dial accordingly, you'll shoot over the gong. At that those ranges the bullet is coming down steeply, so when you get a large vertical error even a small error in range can easily explain it.
The shorter distance was measured with a leica rangefinder and gps confirmed, the longer on was by gps ? I feel fairly confident that the ranges are accurate.
I'll drop you a line to discuss this further after I check the points you mentioned. What does your pda say for a 1130 m target in the mentioned conditions ?
Thanks all for your thoughts. I just want to make that first shot count !