There are many abbreviations used when refering to different ammo types and rounds. Below is a list of some of the common ones, to better help you understand what you are comparing.

JHP = Jacketed Hollow Point

FMJ = Full Metal Jacket

MC = Metal Case

HP = Hollow Point

BJHP = Brass Jacketed Hollow Point

TMJ = Total Metal Jacket or Encased-Core Full Jacket

WC = Wad Cutter

WFN = Wide Flat Nose

WFNGC = Wide Flat Nose Gas Checked

LWC = Lead Wad Cutter

SWC = Semi Wad Cutter

LSWC = Lead Semi Wad Cutter

LSWCHP = Lead Semi Wad Cutter Hollow Point

EMJ = Enclosed Metal Jacket

LRN = Lead Round Nose

STHP = Silver Tip Hollow Point

TFSP = Total Fragmenting Soft Point

SJSP = Semi Jacketed Soft Point

SJHP = Semi Jacketed Hollow Point

LHP = Lead Hollow Point

CLL = Cowboy Lead Load

JSP = Jacketed Soft Point

FN = Flat Nosed

FNEB = Flat Nose Enclosed Base

PTHP = Platnium Tip Hollow Point

PG = Partitioned Gold

HSP = Hollow Soft Point

PSP = Pointed Soft Point

BT = Boat Tail

BTHP = Boat Tail Hollow Point

CT = Copper Tip

TTSX = Tipped Triple Shock X