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Bruce: Well done as you are correct for marginally stable bullets of which the M-16 ala 5.56 in its original speed, bullet size (barrel length of 20 inches) small diameter was one.,

Bullet...

While it should last 8,000 or so there are other factors.

One of the good measurement to have is TE (throat erosion). It tells you how much its been shot though its not a guarantee of...