Would it not be prudent to determine what the performance goal is when considering the powder? I'd assume that with the paper punching as a goal, the "standard" (250-255 grain) bullet weight at roughly 900 fps would be ample. The next piece to me would be deciding the bullet configuration (I'm a reactionary and would use SWC about all the time in that caliber and especially for that purpose). BTW, such a load would also do darned near anything you needed for personal defense whether the predator is two legged or four.

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NHI, 10-8.