sized may not feed through some actions reliably especially when used in semi-automatic rifles. Cartridges which are intended for semi-automatics should be full length resized. Most Weatherby manufactured rifle chambers are machined to very tight tolerances making full length resizing has little effect on extending the case life as the cartridge brass does not have to be worked as much to reform it. If once fired cases are to be used in a rifle in other than one it which it had been previously fired full length resizing the cases is the norm. Criticism On paper the .460 Weatherby Magnum has better penetration than most other rifle cartridges including the .577 Tyrannosaur, .585 Nyati, .600 Overkill and the Nitro Express line of cartridges. However, the .460 Weatherby Magnum was beset by penetration issues from the beginning. Safari hunters had variously reported the round nose bullets' fragmenting and the solids' deforming and core separation which lead to poor terminal performance on heavily boned animals. In such cases, the energy of the bullet is expended through the work performed deforming or disintegrating the bullet rather than directed towards the more productive penetration which is the sole reason for the use of these solid bullets. Early Norma factory ammunition loaded for Weatherby used Hornady RN and FMJ. Norma had been loading these bullets to a velocity of . Norma dropped the velocity of the cartridge to while Hornady introduced the mechanically locked-in lead core InterLock bullets in 1980 to improve the terminal ballistics of their bullets. Subsequently, Hornady introduced the InterBond FMJ (IB-FMJ) and RN (IB-RN) bullets which featured a brass jacket with a welded lead core. The IB-FMJ and IB were loaded by Norma for the Weatherby cartridge. These Hornady .458 caliber round nose and solid bullets were later found to have a performance envelope of not exceeding in the .458 caliber. Hornady has since developed the copper-clad steel-encased bonded core DGX and DGS bullets rated for a velocity of . The new Hornady DGX and DGS bullets are now being loaded by Norma at the reduced velocity of to coincide with the velocity rating of the tougher DGS and DGS bullets. Hornady's performance envelope for the .458 caliber DGX and DGS bullets are between and the same rating they had assigned earlier to the more lightly constructed InterLock bullet. While poor penetration due to bullet construction was not limited to the