Thread: Sighting 200 yards at 100 yards

Originally Posted by Backcountry Bob

I admire those people who sight their rifles in at 100 metres. I always get a little nervous and the spread of my shots makes me doubt my ability.
I prefer to sight in at 25 metres where I get good groupings.
It's hard to find ballistic info for 25 metres though.

I know someone with a 308 who did this. Trajectory says that at 25 and 200 yards the bullet goes through zero and is 2 3/4 in high at 100.
He was happy if he shot 1 inch at 25 yards and called it good.
It wasn't.
First there is parallax to deal with, which moves your sight picture around then 1 inch at 25 is 4 inches at 100 and 8 at 200.
He missed a lot.