Ne, ne govorim o 30-06. Diametar 30-06 je 30. 30 x 0,254 = 7,62 mm
A tacan diametar kalibra 270 je 277. 277 x 0,254 = 7,00 mm
Kopirao sam samo deo teksta gde je poredjenje sa 30-06 posto je 270 "iz njega" nastao.
The .270 Winchester was developed by Winchester Repeating Arms Company in 1923 and unveiled in 1925 as a chambering for their bolt action Model 54. The cartridge is based upon the .30-06 Springfield, and the case is slightly longer due to the necking down process.
Driving a 130-grain (8.4 g) bullet at approximately 3140 ft/s (957 m/s), (later reduced to 3060 ft/s (933 m/s)) the cartridge demonstrated high performance at the time of its introduction and was marketed as being suitable for long range shooting on most big game. Two additional bullet weights were soon introduced: a 100-grain (6.5 g) hollow point bullet for Varmint shooting, and a 150-grain (9.7 g) bullet for larger deer, elk and moose in Big-game hunting. While not an immediate success, over the succeeding decades and especially in the post WW2 period, the .270 Winchester has attained great popularity among gun owners and hunters, ranking it among the most popular and widely used cartridges worldwide. Internationally, firearms manufacturers now offer this chambering in all firearm varieties: bolt actions, single-shots, lever-actions (such as Browning BLR), Pump-actions (such as Remington 7600), autoloaders (such as Remington 7400) and even a few double rifles.
Factory bullets are commonly available in 100, 130, 140, 150 and 160-grain (10 g) sizes with 130 and 150-grain (9.7 g) loads being by far the most popular. Handloaders have a larger range of options with the availability of bullets in a number of weights from 90 to 180 grains (12 g). Common bullet weight recommendations for shooting different game are as follows:
90-110 grain bullets: animals smaller than antelope.
130 grain bullets: antelope or other animals up to the size of mule deer.
140-180 grain bullets: deer, elk, moose and anything larger.
While it is true that a .270 Winchester case can be formed from a 30-06 Springfield case, the case length of a 30-06 is 2.494 inches (63.3 mm) while the case length of a .270 is 2.540 inches (64.5 mm). .
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Type Rifle / Hunting
Place of origin United States
Parent case .30-06
Bullet diameter 0.277 in (7.0 mm)
Neck diameter 0.278 in (7.1 mm)
Shoulder diameter 0.441 in (11.2 mm)
Base diameter 0.47 in (11.9 mm)
Rim diameter 0.473 in (12.0 mm)
Case length 2.540 in (64.5 mm)
Overall length 3.340 in (84.8 mm)
Rifling twist 1-10
Primer type Large rifle
Bullet weight/type Velocity Energy
90 gr (5.8 g) HP 3,603 ft/s (1,098 m/s) 2,595 ft·lbf (3,518 J)
130 gr (8.4 g) SP 3,060 ft/s (930 m/s) 2,702 ft·lbf (3,663 J)
140 gr (9.1 g) SP 2,916 ft/s (889 m/s) 2,644 ft·lbf (3,585 J)
150 gr (9.7 g) SP 2,850 ft/s (870 m/s) 2,706 ft·lbf (3,669 J)
Source: Hodgdon