What kind of bullet is this?

Sorry, no pics, but I have a 7mm Rem Mag loaded with a dark purple bullet that fades to red on the plastic tip. Any body have any idea what kind it is and who made it?

Sounds a bit like a Nosler Combined Tech bullets, IE: Winchester graphite coating on a NBT bullet. These were (with a silver/gray plastic tip) also loaded in factory Winchester “Silver tip” ammo.
Might also be a Hornady A-Max loading.
Assuming it’s not a reload, you might check into what offerings the maker (see headstamp) offered