Quote Originally Posted by The Lord Flashheart View Post
1" higher would make sense with a lower velocity load if he was measuring the maximum ordinate.

In other words if he zeroed at 200 yards he would then expect something like 1" high at 100 yards. If he found that it was in fact 2" high at 100 yards on shooting the lower velocity is indicated.

weird one, losing 500fps seems almost impossible without maybe having used a much slower powder in the second set of loads.

Soot on the cases?
There's also the simple fact that lower velocity rounds exit later in the recoil cycle. Certainly in pistol shooting, high strikes are generally a sign of reduced velocity.