Rifle

All modern 8mm rifles, including all German military arms manufactured since 1905, use .323 inch diameter bullets. However, German military rifles manufactured between 1888 and 1905 used a .318 inch diameter bullet. Many of those rifles were rebarreled to .323 inch bores after 1905, but some rifles of the smaller bore size were brought back from WWI and WWII and still exist. Some German sporting guns, particularly combination guns made until 1938, used 8mm cartridges with .318 inch diameter bullets. Sometimes, a .323 inch diameter bullet can be loaded and fired in a cartridge intended for a .318 inch groove diameter, but dangerously high chamber pressures result. If you do not know that your bore size is .323 inch, slug your barrel before loading .323 inch diameter bullets. There are two Pro-Hunter bullets in .323 inch caliber in Sierra's line and both are the Spitzer type. These 8mm hunting bullets provide exceptional accuracy together with deep penetration and reliable expansion on medium and heavier game. The 175 grain #2410 gives the 8x57mm shooter an excellent big game bullet and is suitable for 8mm magnum cartridges.

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.