I have a centerfire cartridge that I can’t identify.
The bullet has a ridge at the base almost like it’s heeled.
The bullet is non-magnetic.
The base has a slight convex to it.
HS = ZG C (not sure about the G)
Bullet Dia. = .417"
Bullet Dia. @ Ridge = .438"
Rim Dia. = .515"
Base Dia. = .460"
Case Len. = 0.75"
O/A Len. = 1.184"
There are 3 point stakes around the base of the bullet.