Anything is better than nothing as long as the bullets hit the right spot.. In the words of the late Jeff Cooper "A .22 bullet in the eye works as well as a .44 mag to the chest". As far as ammo types the Speer Gold Dot SB is the best ive tested. From seven yards it will penetrate a windshield and still pass through 12 to 16" of water depending on the caliber. The .45acp being the champ. Shot a GDSP 124grn 9mm through my buddies 16" barreled Uzi. Passed through the windshield and 14" of water. Recovered bullet weighed 123grns.
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