[Magnum Wheel Man]

I assume you are talking about the crimp "groove" which would have been under the base of the bullet, or crimped into a crimp groove below the case mouth??? depending on the cartridge ( 357 Magnum for example ) they may have been double crimped to help control bullet jump from recoil... I've reloaded 357 ( for example ) a couple times, & fire formed, & resized the bottom crimp out of the case after several reloadings ( they are definately reloadable, so long as they are brass & boxer primed ) I try not to buy those type of cases for reloading though, as it ends up being a weak point in case, & more often than not, that's the 1st place to crack