Like I said in the thread on another forum you posted on, those bullets are probably meant for loading 45 ACP ammo, not 460 Magnum ammo.
Hornady makes an XTP bullet and an XTP MAG bullet, the MAG bullets are meant for loading the 454 Casull and .460 Magnum but not the others. Usually, bullets without a crimp groove are meant for semi-auto loading, not revolver ammo. The exceptions are plated bullets which don't have crimp grooves but they are also not meant for high pressure cartridges because they can't withstand the higher pressures/velocities. Also, 200gr bullets are on the light side for loading the .460 Magnum.