Quote:
If you aren't getting keyholes...
Shooting off a bench without a sling at all three distances?
Bean bags, shooting sled, off your fist?
I had a rifle I shot off a bench at 50 as shooting prone would have required laying on the shooting bench, then set-up properly prone with a sling and everything went haywire. Tension on the sling pulled the stock into the barrel. Not enough to take it off paper though.
Is the load you are shooting at a much greater velocity or wit a much different weight bullet than the other loads? Your twist rate may not match your current load.
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No keyholes - all groups were shot off of a lead-sled while lying prone. I was shooting all the same ammo. That is an interesting case though, I will try and think if I changed anything on the 100 yard shots.