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Posted: 11/15/2009 8:55:11 AM EDT
| Guys it is my understang that if the upper is chambered in 5.56/223 i can shoot both and be fine. if it is in 223/5.56 I could run into problems with the primers causing malfunctions right? |
| While the actual cartridge portion of both .223 Remington and 5.56mm NATO chambers is identical, the part just past where the bullet goes, known as the "leade" is very different. This is the part where the rifling begins, and how long and steep the angle is is critical. .223 chambers have a short, steep leade, while 5.56mm chambers have a longer, more gradual leade, allowing the latter to handle higher pressure loads. |
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