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Originally designed with a 1-in-14 twist barrel, the 40 grain .22 Hornet bullet was the standard load. It could also be loaded with lighter or heavier-weight bullets available at that time for the .22 Hornet as well as most bullet weights up to 50 grains such as that used by the .222 Remington (5.7×43mm). [ 4 ]
The 8×64mm S (also unofficially known as the 8×64mm S Brenneke) (the S means it is intended for 8.2 mm (.323 in) groove diameter bullets) is a rimless bottlenecked centerfire cartridge developed as a military service round for the German Army who never issued it.
Changing the diameter of the case (to suit a new caliber). Called "necking up" or "necking down", this is the most common way of making a wildcat. The new caliber allows a different range of bullet weights, and can greatly increase the velocity or the power or the resistance to wind drift as compared to the parent cartridge. Necking back.
The Taylor KO factor multiplies bullet mass (measured in grains) by muzzle velocity (measured in feet per second) by bullet diameter (measured in inches) and then divides the product by 7,000, converting the value from grains to pounds and giving a numerical value from 0 to ~150 for normal hunting cartridges.
A .257 bullet has a metric bullet diameter of 6.53 mm. However, in Europe cartridge designation nomenclature for a large part relies on the bore diameter. As the bore diameter of the .257 Weatherby Magnum is .250 inches this would make it a 6.35 mm caliber cartridge which uses 6.5 mm bullets (not to be confused with 6.5 mm caliber cartridges ...
The 8×60mm S bullet diameter is 8.22 mm (.323 in) as found in the 8×57mm IS. The new cartridge used the same bullet and therefore only the chamber of the rifle had to be modified (reamed out by 2 mm plus 1 mm of neck extension) to accommodate the slightly longer case. This operation was easily performed on Gewehr 98 and Karabiner 98k rifles ...
The cylinder is bored straight through with no step. Later versions used an inside the case lubricated bullet of .357" diameter instead of the original .38" with a reduction in bore diameter. The difference in .38 Special bullet diameter and case diameter reflects the thickness of the case mouth (approximately 11/1000-inch per side).
This twist rate was chosen since the bullet jackets used in the 1930s were not strong enough to cope with the forces generated by the magnum muzzle velocities of the 8×68mm S. The 240 mm (1 in 9.45 in) twist rate normally found in the 8×57mm IS makes the 8×68mm S combined with modern bullets with jackets designed for magnum cartridges an ...