Greetings Superdriver,
Sounds as though you have a long throat. Mine has and shoots flat base projectiles better than boat tails, from sub Moa to Moa plus. The point of impact does seem to move after the first three shots, possibly a bedding problem? You could try shooting only three shot groups with plenty of time between the groups. That would be a better indication of practical accuracy.
Just a thought.
Grandpamac.
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