Tuesday, February 12, 2013

.223 versus 5.56...Difference?

Well of course there is. Click here.


Bah_humbug said...

Here is a very detailed piece too:
Ammo Oracle

Fits said...

"The M14 program was a political minefield and during the early 1960s, minor US involvement as "advisors" (SIC...Fits) in the southeast Asian country called Vietnam was beginning to escalate. It didn't take long before the Vietnam expansion, coupled with manufacturing problems with some M14 contractors, resulted in too many soldiers and too few M14s. The military initially pulled WWII M1 Garands out of storage and pressed them back into service, but these long, heavy rifles were poorly suited to the jungle environment of Vietnam."

Bullswaddle. The 14 was simply too big and heavy for the South Vietnamese to carry and Vietnamization was lagging because of it. The 14 was approximately the size and weight of an M1, and the M1 was used in every jungle the Marines fought in during WWII. And this under 200 yard nonsense has got to stop as well. The 7.62 was and remains a far better brush buster than the 5.56, and actually kills people as opposed to simply giving them the ouchies.

Thanks for the link.

Fits said...

More on the varmint rounds used in many military 16's:

"Due to the poor performance of M855 ammunition, particularly in short-barreled carbines of 10.5-14.5" in length, Navy SEALs, and eventually other SOCOM units, began experimenting with using loads originally designed for marksmanship units for combat. It was soon discovered that while these loads were both very accurate and had excellent terminal ballistics even from short barrels, the loads weren't quite ideal for combat. The target bullets had no cannelure, and the bullets weren't crimped in place, which could allow bullet set-back during feeding and raise chamber pressures to dangerous levels. Further, most loads were of somewhat mild velocities, as the load was chosen with accuracy, not terminal ballistics, in mind.

Sierra was asked to produce a bullet cannelured version, but they intially refused.

Nosler did not have any problems putting a cannelure on their 77 gr bullet. Black Hills Ammunition was approached to make a slightly modified version of these loads for combat use. A cannelure was specified, the bullets were to be crimped, and the load was to be up to military chamber pressures, with maximum safe velocity being desired. The primers were to be crimped and sealed, and of course, overall length had allow for loading in standard magazines.

The Marines (in conjunction with a large Federal LE agency) did extensive testing of this large experimental batch of BH loaded Nosler 77 gr cannelured OTM's in the Fall of 2002. It offered outstanding terminal performance out to the maximum test distance of 300 yards. They then ordered 1.1 million rounds of cannelured 77 gr OTM's via the existing Mk262 SOCOM contract (which did not specify a manufacturer) administered through Crane. The cannelured 77 gr load was designated Mk262 Mod 1, and the orginal Mk262 was re-designated Mk262 Mod 0."

"Terminal Ballistics" refers of course to stopping power, and for decades our armed services have been trying to beef up the puny 16's ability to do so. Accurate or deadly, that's been part of the dilemma.

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