I'm too cheap to buy much factory ammo...and like messing with stuff..so
I found the little brother 9mm version of my 275 grain 45 bullet, from Matt's Bullets (pretty sure it's a Lee 158 WFN design). This might be about as good as I've found for a 9mm bear defense load. Feed great and 1,000+ fps is pretty easy to do from a 4" barrel if desired. Meplat is about 0.275", so about 77%. Probably can't get much higher than that. I had him cast mine in 18 Brinell alloy.
L-R 275 45, 160 WFN 9mm, 158 SWC, 147 FP
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Compared to Underwood and 158 SWC loads
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Loading depends on your pistol. The short loaded 160 fits the chambers of all the 9mms I tried. The long one actually fits fine in my Rugers, and one other, but that's it. I was surprised how much the leades varied. Loading short works best with lightweight brass (Speer/Federal/Blazer - all basically the same) but not heavier stuff, especially military headstamp brass.
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Oh, and almost forgot...last Saturday I got home late from a town trip and when my dog arrived behind my truck she went on full bear alert, hackles up, stiff legged bouncing into the trees (about 10 ft visibility), I carefully followed (carrying a 9mm...) but whatever was there apparently didn't want to play. The next day I found a big wad of grizzly undercoat about 40 feet from the front door, and 10 feet from the wood pile...I guess we just barely missed each other...