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I have shot a lot (6 to 7 thousand rounds)and I find the port to be more consistant .Fal,hk 91 (real one) M1A and PTR 91 ,cetme. how do you find aussi to be better quality ?
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More consistant OAL
More consistant powder charge
More consistant bullet weight etc...
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JMO, in my (limited) experience, aussie and port appear to function equally well in my SA M1A Scout Squad. Both (now that aussie is in blisters) are packaged in a watertight container. I believe (no matter how much anyone may argue differently) that with military surplus ammunition, there is really NO WAY TO GUARANTEE that it did not spend some time in 'less than optimal' conditions. Remeber, this is SURPLUS ammo, and had tome come from somewhere. Therefore:
If you are looking for cheap plinking ammo, probably either one would be a good choice, but in general, the newer the manufacture, the less chance that the ammo was sitting in some hot warehouse in the desert somewhere. So as long as there aren't reports of serious problems with a particular lot/source, I would pick the newest available, in this case Austrailian.
Also, if you are stocking up SHTF ammunition for a 7.62 by 51 rifle, I would shy away from any mil surplus stuff for the above reasons. In my opinion, it is better to but a case lot of new manufacture BHA 150gr Noslers or WRA 150gr SBST (also a Nosler bullet by the way) and store it carefully. (load it on strippers and bandoliers, then in GOOD quality ammo cans WITH DESSICANT) Then 'rotate your stock' every 1-2 years. If you are like me (paranoid as hell) then you don't mind spending the extra cash on good ammuntion for self efense. Getting rid of the ammo is a good excuse to shoot a lot of rounds anyhow, something everyone who thinks they will use their rifle in a defensive mode should do on a regular basis anyway.
I realize that the above mentioned 7.62 rounds are not 'sealed', like nato stuff, but if stored properly, as noted above, water should't be a problem. No matter what the circumstances, I would think twice before I loaded up my M1A with ammo that had been sitting in water, sealed or not.
As for 5.56 ammunition for defense / SHTF use, after reading for MANY hours, my opinion is that the BHA 77gr Nosler NATO loads compromise the least, especially if you have a mil-spec 5.56 barrel (1:7)
For 5.56 plinking I use the Federal LC XM193 - cheap and mil-spec.
Again, just my opinion.