I'm going to have to disagree on the depth of the hollow point. I spent a bit of time yesterday playing around with the really long narrow hollowpoint that I was getting inconsistent results with and found that by adding a small 45degree flair to the nose of the HP, I got excellent expansion on all 5 rounds I tested. The projectile expanded up to around 0.460" and the mushroom curled all the way past the base of the projectile, so the whole thing was maybe 4mm thick. Unfortunately I forgot to take photos and am now at work.
The downside to this deep hollow point is that it works the projectile a lot and I'm finding not all brands can handle it, so a smaller hollow point with a little less expansion is probably more practical in the real world.
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