They don't have to. They're already there.
Well, that's the ballistics physics of bullet/cartridge design.Does a bigger caliber hollowpoint expand (better) at a slower speed?
Unless you give it enough velocity to penetrate to the depth you desire.A specific JHP bullet driven to a higher speed than another will have larger expansion, and will usually have lesser penetration.
For expanding rounds, bullet design has greater influence in penetration than velocity has.Unless you give it enough velocity to penetrate to the depth you desire.
Once upon a time, that was pretty much true; and with older design hollow points, it is often still true.great replies here thanks!... I keep hearing to just use wadcutters for my colt 45 for home defense round since most hollowpoints wont expand under 1000fps. Well obviously its not the case here. These Gold Dots do look like an excellent round for the colt 45 according to the article.