Energy is transmitted to remote locations because of "hydrostatic shock".Īll of that ignores the reality of how handgun bullets wound. Nothing is elastic, the fluid isn't under pressure and is even distributed, nothing is pushed out of the way, nothing causes the bullet to fragment, etc, so all that matters is "energy transfer". Put more and bigger holes in it, it drains faster. In their argument, the body is basically a bucket of water. You get a lot of discussion from the "I believe in physics" crowd, who really mean they don't understand wounding. The easy answer is: Pick something of DocGKR's list, verify it feeds well and is accurate, stop worrying about it because marginal differences in terminal ballistics are largely irrelevant in who prevails in a gun fight. Failing that, sufficient penetration (12-18") first, then how it deals with bone, then expansion. If you want to blow up crows or something, fine, but if your goal is people I'd stick to ammo passing ALL of the FBI specs when possible. They make messy but shallow wounds, do not do well on bone strikes, and fail to penetrate sufficiently in many instances due to early excessive expansion and/or fragmentation. Honestly, I would take ball or wadcutter ammo over an over-driven expandable round. HST, Critical Duty, and Gold Dots are all proven options. Copper can be a lighter recoil alternative, but you are giving up some performance on bone strikes and expansion after barriers (and remember barriers can include forearms). 45 Autos that pass all of the FBI battery are consistently 220-230gr weight in either standard pressure or +P. If not, 147gr HST is a solid performer, and does well from any barrel length.ĭPX copper bullets are good bullets, but if you drive them too fast the petals can sheer off and what you've got is a lighter wadcutter. CD works well, if it's accurate from your pistol stick with it. If you do forge ahead with this, accelerate your maintenance schedule for recoil spring assembly swaps, etc. S&W says the Shield will tolerate +P+ but recommends against them, you'll reduce the service life of your firearm. "+P+" is not an actual SAAMI term and simply means the bullet is outside recommended manufacturer Specs. If you make the switch from Critical Duty 135 to over driven 115gr (and it appears Underwood overdrives it by about 300fps vs what the manufacturer designed it for) you're paying more money for reduced effectiveness.
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