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56 might not be stabilized very well with a 1-16. Shoot something past 100yds to see if they keyhole.....
The last time I shot cast, the bullets hit square on but groups were inconsistent. It was windy, but ....
I did try some 55gr Nosler BTs with the exposed lead tips cut off and to my surprise, gave the best results - better than 45gr - even though the yaw was visible on the bullet hole imprint. I have fired a few longer shots with 55gr Hornady's and they seemed to be going nose first. I shall be trying out some more loads this weekend - those will include some 60gr's with the lead tips cut off and the Nolser�s whole. This time I will be using Lil'Gun, giving much higher velocity. (That stuff puts the hornet up a notch)!