I have not had a problem with bullets moving in a case when firing as long as it's a good fit in the case. But I have had much better accuracy in a 30-06 using a 150 gr flat based bullet. The boat tail takes away just enough length to not let the bullet stabilize 100%. Groups in general are bigger. Using a heavier bullet that is boat tailed is OK as the length of the bullet allows it to be more stable and one gets better groups. But in the 150 gr class the flat base is better. Also try to load it to about 2700 fps which is the true velocity of M2 ball ammo. Commercial soft point bullets are even better for accuracy.Information
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