What distance are you shooting?
I recently read a thread on another board where a person was having keyhole issues as well. His was a centerfire and every type of round keyholed. After a lot of frustration and ammo consumption he decided to fire at a closer target. It turns out the guy had his scope adjusted so that the bullets where hitting the ground about midway to the target then ricocheting up into the target.
I am not saying this is the case with you but if you are shooting at a long distance it might be possible the bullets are hitting something in between.
Here is the thread if anyone is interested in reading it:
http://www.ar15.com/forums/topic.htm...=318086&light=
The guy was honest enough to come back in and say what was wrong. We all got a pretty good checkle out of it.
Dolomite
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