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The standard bullet diameter for 6 mm caliber cartridges is .243 inches (6.2 mm), the same diameter used in the .243 Winchester and 6mm Remington cartridges. To obtain maximum accuracy, bullet weight and form are matched to the rifling twist rate of the barrel. Typically, 68 gr (4.41 g) bullets are used in barrels with twist rates of 1 in 13 ...
Newton recommended loading 100 grain (6.5 g) bullets at 2,800 ft/s (850 m/s); but Savage Arms reduced bullet weight to obtain a velocity of 3,000 ft/s (910 m/s), making it the first American cartridge capable of that velocity. Achieving that velocity may have been the reason for the choice of the light-for-caliber 87-grain (5.6 g) bullet. [3]
Thus the optimum rate of twist for this bullet should be approximately 12 inches per turn. The typical twist of .30-06 caliber rifle barrels is 10 inches per turn, accommodating heavier bullets than in this example. A different twist rate often helps explain why some bullets work better in certain rifles when fired under similar conditions.
This is a list of firearm cartridges which have bullets of a caliber between 6 millimetres (0.236 in) and 6.99 millimetres (0.275 in). Length refers to the cartridge case length OAL refers to the overall length of the cartridge
Other variations of commercially loaded .243 ammunition are available with bullet weights ranging from 55 grains (3.6 g) up to 115 grains (6.8 g). Twist rate of the barrel can sometimes be a factor in deciding which bullets to use, 1:10 being the most popular as it is sufficient to stabilize up to 100 gr bullets.
The .243 Winchester Super Short Magnum or .243 WSSM is a rifle cartridge introduced in 2003. It uses a .300 WSM (Winchester Short Magnum) case shortened and necked down to accept a .243in/6mm diameter bullet, and is a high velocity round based on ballistics design philosophies that are intended to produce a high level of efficiency. [2]
Initially the Model 1895 was available only chambered in the 303 Savage, a similar cartridge to Winchester's .30-30 but usually loaded with heavier bullets of 185gr or 190gr. The Model 1899 was also only available in 303 Savage initially, but in 1900 they added the 30-30 and in 1903 they added the 25-35, the 32-40, and 38-55.
Bullet diameter.224 in (5.7 mm) ... Rifling twist: 1-12" Primer type: Large rifle: ... (Models 70 and 670) and Savage (Model 340). All commercially produced rifles ...