"heavy magnum" loading that features a bullet with a velocity of approx . They use a special double-based cooler burning propellant ("powder") not available to the public for handloading. This innovative loading allows the .458 Winchester Magnum to attain of muzzle energy. Federal Cartridge is now loading a Barnes X bullet with a sectional density and ballistic coefficient that allows it to maintain approximately of energy at and a flatter trajectory than has ever before been attained with this cartridge and bullet weight. Numerous companies offer rifles in this caliber, including the Winchester Model 70, which was used by Clint Eastwood in Dirty Harry. The rounds for the .458 Win mag are more expensive than cartridges like the popular .30-06, making handloading a worthwhile effort. Though more expensive than deer hunting ammunition, the .458 Winchester Magnum is significantly less expensive than its competitors. For many decades the .458 has been the most popular rifle cartridge of professional hunters who pursue heavy dangerous game in Africa because of its performance, price, and availability. When British ammunition companies, including Kynoch, began closing in the 1960s, Winchester and the .458 Winchester Magnum filled the gap left behind. The recoil of the factory loads is about 70 foot pounds. Handloads can make this cartridge more comfortable to shoot, for example using a cast lead bullet at . This load mimics the .45/70 in both power and recoil. {| class="wikitable" border="1" |+ .458 Winchester Magnum Ammunition |- | style="background: #eeeeee" width="180pt" | Ammunition | style="background: #eeeeee" width="210pt" | Bullet | style="background: #eeeeee" width="140pt" | Muzzle Velocity | style="background: #eeeeee" width="140pt" | Muzzle Energy | style="background: #eeeeee" width="200pt" | MPBR/Zero | style="background: #eeeeee" width="180pt" | Notes |- | style="background: #eeeeee" | Winchester X4581 || Winchester SP || || || / || Currently in production |- | style="background: #eeeeee" | Winchester S458WSLSP || Nosler Partition || || || / || Currently in production |- | style="background: #eeeeee" | Winchester S458WSLS || Nosler Solid || || || / || Currently in production |- | style="background: #eeeeee" | Federal P458T1 || TBBC SP || || || / || Currently in production |- | style="background: #eeeeee" | Federal P458T2 || TBBC SP || || || / || Currently in production |- | style="background: #eeeeee" | Federal P458T3 || TBSS Solid || || || / || Currently in production |- | style="background: #eeeeee" | Federal P458D || Barnes TSX || ||