40 S&W is essentially just a short 10mm round, it features higher breach pressure than both 9mm and. Regardless of your budget, you’ll get more training reps for your money, and therefore become more proficient with your gun, if you shoot 9mm - helping with that whole shot placement thing. Over the course of 1000 rounds, you could pay about $80 more for your ammunition if you’re shooting. That’s why the cost of your ammunition matters. But, the emphasis on shot placement is a reminder that, if you miss, you’re effectively shooting a zero caliber bullet. Very small rounds may not penetrate the breastplate or other bones.Īnd, saying that caliber is irrelevant suggests that you could use a BB gun, so long as you hit them in the right place.Ĭaliber does matter. Now, that’s not to say that caliber doesn’t matter at all. No matter where you go, the common wisdom is that shot placement is more important than what caliber you shoot. There are three key things to consider when picking the best self-defense caliber beyond terminal performance. Use a rifle if you want good terminal performance. And, it means that if a gun fires a bullet with enough energy to knock a person down, the recoil will be strong enough to knock you down when you shoot it.Įqual and opposite reactions and all that. (Photo by FBI)Īnd, before you start in on “knockdown power,” knockdown power doesn’t exist in handguns.īut, Newton’s Third Law does exist. Just a few years ago, the FBI released a study the affirmed the 9mm as the best round for its agents.
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