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I am considering either Underwood Penetrator +p+ or Buffalo Bore Penetrator +p+. They both seem like good choices. Anyone have a favorite?
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Well, from a basic materials science standpoint, a machined copper projectile will deform less and have better penetration through "hard' materials like the skull of a bear then hardcast lead.
The absolute hardest "hardcast lead" bullet is 30 Brinell.
Copper has a Brinell hardness of 80-85.
The other advantage of the underwood load is that for regular, 2 legged SD, it will offer a bit better performance then the hardcast lead, which will perform like a standard ball round.
I would opt personally for the +p+ Underwood extreme penetrator, and purchase a few boxes of Federal 115gr +p+ 9BPLE. This ammo is fairly cheap ($0.30-$0.36 per shot) and will allow you to familiarize yourself with the recoil of the Underwood, without spending over $1 a shot.