Hi Matt, I havnt had experience with .222 FMJ. But I have had a fair bit with 5.56 FMJ. First in Vietnam, I never carried the Armalite, I carried the M60. But I did closely examine some of the wounds made by this evil little bullet and said 'Lord if I am Going to be hit with anything let it not be with one of these little bastards". The entry would be a small innocuous looking pinhole with a 4 inch circle of blue destroyed flesh caused by the hydro static shock. If the projectile had hit bone the exit had to be seen to be believed. A bullet that passed through and arm would blacken the flesh from nearly the elbow to the shoulder.
This projectile was barely stable in flight but being pointed and boat tailed it had little surface area to keep it stable in flesh. The m16 and its attendant ammo 'I think' came very close breaching the Geneva Convention I can remember quite a fuss about it at the time.
I liked using the FMJ from the air on deer targeting the head neck and spine.
I even got a bit cocky in an ammunition crisis and started using the 5.56 in my .222 mag though the chamber was a little long. The experts warned against it and they were right. I blew the extractor out of the Vixen and got a snout full of hot particles it was a cheap lesson I suppose.
The 45gr were effective because they were hard and they were really travelling. Some loads were reputed to be up around the 3500 fps.
I do believe that the whole trebbly family has a killing power way beyond what you would expect from its statistics. I still watch with amazement as a stag hit through the shoulder can just buckle and hit the ground. Or I pull the engine out of a deer and find splits in the deers liver from the projectile passing through 18 inches away and the rest of the organs bruised and torn from the hydrolic effect of the fast expanding bullet and I say fuuuucccckkk.
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