For a high pressure cartridge, jacketed bullets must be built with thick tough jackets not only for proper integrity on game, but also to advoid premature erosion of the top strap and forcing cone. The Speer 300 gr Gold Dot(now named Deep Curl) was designed fopr the .454 Casull and works fine in the .460 because they operate at roughly the same pressures.
The jackets on our 250 and 260 gr HPs and our 300 gr Uni-Cor SP are rated to a little over .44 mag pressure so they can be used for practice or even hunting as long as pressures are held back Loads here for those bullets produce less than 37,000 psi and should not be increased to advoid erosion of critical gun parts.
