OK, thanks...I'll do just that. I finally took a (lousy) photo of the bullets:
The 275s are rounded on the sides, but the 300 is flat (I think this is the truncated cone alluded to earlier). The 300 also has a huge groove in it towards the base.
I'll use your starting data for the 300s and see how they do. I'll figure something else out for the 275s.
Thanks again for all of your help.
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M. Zimmers
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