Friday, April 23, 2010

The .30-06 Cartridge

It's probably the most well known cartridge in the United States. Popular as a large game caliber, this round has probably taken more North American deer than any other cartridge save for the .30-30. But hunting wasn't what it was developed for. This rifle cartridge has seen the US through two World Wars in addition to Korea. Of course, I'm talking about the ever popular .30-06.

As the name implies, the .30-06 is a .30 caliber round developed in 1906 when the U.S. military saw the need for a long-range round capable of being fired from their newly developed machine guns. European military forces were beginning to use the recently designed boattailed spitzer bullets with superior aerodynamics and longer effective ranges. Mortars and artillery were not in widespread use at the time, with military leaders relying instead on volley fire for indirect engagement of enemy positions. Naturally, this meant that bullets would need to be able to travel in excess of 1,000 yards and still maintain sufficient velocity. The .30-03 was obsolete almost as soon as it was put into production, being a relatively heavy bullet with a round-nose tip among other problems. Given these flaws, designers scrambled to modify the .30-03 into a more workable design and created the .30-06. The Springlfield M1903 was also modified to utilize the new cartridge. By shortening the case neck slightly and completely changing the bullet from a heavy 220 grain to a sleek 150 grain spitzer, the military soon had their new solution.

After World War I, military planners noted that machine guns employed by other nations had much longer effective ranges than those used by the U.S. firing the 150 grain .30-06. It was decided that the .30-06 design needed to be improved upon in order to reach out to these longer distances. The .30 caliber M1 ball cartridge was created as the answer to this problem. A 173 grain FMJ boattail bullet was utilized for the M1 ball, but was later replaced with the lighter 152 grain flat based bullet in the M2 ball cartridge when it was discovered that the M1 load was more powerful than most military ranges could safely accommodate. The lighter, faster M2 round had a muzzle velocity of around 2,740 FPS in a 24" barrel and quickly became the standard issue ammunition for machine guns and infantry rifles, remaining in service until the development of the 7.62x51 NATO round. Nevertheless, the USMC kept some of the heavier M1 ball for use among their snipers, as that bullet was slightly more accurate and carried a bit more energy at longer ranges.

The long ranges the .30-06 was designed for also made it very attractive to hunters and long range target shooters seeking a cartridge was both versatile and accurate. The flat trajectory of the .30-06 makes it very effective for taking medium sized game with little to no elevation adjustment needed for distances out to nearly 300 yards. Modern hunting ammunition in .30-06 is available in a wide variety of loads with bullets weighing between 120 and 220 grains, but is most commonly found loaded with bullets between 150 and 180 grains. The case capacity of the .30-06 brass allows it to be loaded to much higher pressures than mil-spec ammunition. Many modern cartridges are loaded to these higher pressures in rifles capable of handling the hotter loads giving the round a muzzle energy that approaches 3,000 foot-pounds.

Given the versatility of this well-rounded cartridge, it's no wonder that it remains one of the most popular cartridges among hunters and target shooters alike.

1 comment:

  1. Dewayne, about 20 years ago Askins wrote a piece in the American Rifleman, The 30-06 Is On The Way Out, or something similar. Readers were really up in arms over that. Typical Askins - Mr. Controversy. It was fun reading all the letters to the ed. I doubt he thouhgt that, but I'm pretty sure he got the reader response he wanted. He probably held stock in postage stamps ... lol!