Bullets or what is UMC?
Posted by KAT on 20th Aug 2015
Bullet types can be confusing.
Here's some of the more popular bullets and the usages, advantages & disadvantages.
FMJ, FMC, MC, UMC - Full Metal Jacket (Full Metal Cover, Metal Cover). This bullet normally has a lead core and a copper jacket. Sometime called a round nose. The bullet is normally used for target shooting. It has a fully jacketed covering normally in copper. It prevents lead fouling in a barrel. The jacket can cause the bullet to over penetrate because the bullet doesn't expand much after striking an object.
LRN - Lead Round Nose. This bullet is all lead so it has the advantage of being softer than a FMJ and will expand better on impact. The disadvantages are that the lead is not encapsulated and therefore some areas will restrict the usage of this type of bullet. Also because it is all lead, you get get some lead fouling in your barrel.
JHP, HP - Jacketed Hollow Point, Hollow Point. This bullet is mainly for self defense, It is designed to expand after striking an object and penetration is limited. A jacketed hollow point has the advantages of a FMJ bullet to prevent lead fouling but has a hollow nose.
SP, JSP - Jacketed Soft Point, Soft Point. This bullet has an exposed lead tip. Sometime called a partially jacketed bullet.
SWC, WC - Semi Wadcutter, Wadcutter. These bullets have a blunt tip. They punch a hole into a target. You will see these on .38 revolvers and the semi wadcutters are favored by target shooters as they travel at a lower velocity and punch a nice clean target hole which helps in scoring.
Then there's the +P cartridges and +P+ cartridges. These are higher pressure cartridges to give the bullets in handguns more punch in self-defense ammunition. Be sure to make sure your particular handgun is designed for these high power cartridges as the higher pressures can damage some handguns.