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particle wrote:In addition to affecting the way the bullet expands, I always thought the polymer tips were supposed to help the bullet feed better in guns that don't cycle hollow points very well.

That to

Dont forget about the Z-MAX ammo Its just critical defense with green instead of red.

The polymer tip in thous rounds are to keep a bullet from premature expansion, like when striking a heavy winter coat. After the round penetrates to the body the much harder surface will force the polymer into the cavity then allow the hallow to expand correctly. This is all in theory of coarse, and to my knowledge the new ones are far better.