Sierra offers a single flatnose bullet in this 45 caliber specifically for the 45-70 bore size. It may be used in rifles or handguns with a .458 inch bore, but it must not be used in handguns with .451 or .454 inch bore size.

Sierra introduced this bullet in 1973 - the 100th year of the 45-70 cartridge. Now, decades later, this old cartridge is still growing in popularity and justifiably so. Adequate for any game in North America and offered in several modern firearms, this old cartridge is just plain fun. The bullet is unique in that it expands well at modest 1873 Springfield velocities or at the more powerful full charge velocities that can be loaded in stronger action types, such as the Ruger No. 1 and No. 3 and Marlin lever actions. Accuracy is excellent, and it feeds reliably through all types of magazines and actions. It can be used in the 458 Winchester Magnum cartridge, but muzzle velocities should not exceed 2500 fps.

For handguns, this bullet was designed to expand reliably even at 1300 fps. It is a perfect match for the T/C Contenders and similar handguns chambered for the 45-70 cartridge. Dependable expansion and excellent accuracy make this Pro-Hunter bullet a good choice for most hunting situations.

.45 Caliber (.4515) 300 gr. JSP
Despite its "soft point" title, this 300 grain #8830 Jacketed Soft Point (JSP) SportsMaster is the single hardest bullet Sierra has produced. Utilizing a 6% antimony, 4% tin, 90% lead alloy core, this 300 grain JSP will expand only on the toughest game when driven at absolutely top-end velocities. Intended primarily for the strongest 45 Colt revolvers (Freedom Arms, Dan Wesson, and Ruger revolvers), the single-shot T/C Contenders and the 454 Casull revolvers, this bullet is an excellent selection for the heaviest game on any handgunner's agenda. Because of its length and solid construction, this bullet cannot be used in Colt Single Action Army revolvers or their modern reproductions. This bullet was introduced by Sierra in 1994.