Doug Ridley: There are several possibilities, Wadcutter, Semi-Wadcutter, and Lead Flatnose. Each of those bullet types come in a variety of weights and each may be loaded in a differently named cartridge.
The wadcutter is column shaped. The semi-wadcutter has a step above the shell rim and is a truncated cone. The flatnose is a cut off sphere or a truncated cone.
Posting a picture is a good idea.
Once you have the bullet type and weight then just google.