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Discussion Starter #21
Bummer about the end of the Lake City surplus brass. That's how I built my stockpile.

Is there any advantage to polymer cases other than weight and I suppose cost?
Anywhere from 35% to 60% reduction in weight, depending on the design. Some designs are partial brass, like shotgun shells, for more dependable extraction. Some have brass necks, to better handle heat at the barrel throat. Cost is a factor also. Another is consistency. Polymer can be made to closer tolerances and it doesn't lengthen under pressure, so tighter headspace tolerances can be used, which I've read (I am not an expert in this) can theoretically improve accuracy. Also, polymer does not transfer heat to the chamber like brass does, so theoretically, chambers will last longer.

I don't know how much of that is true and how much is contractor marketing hype, but that's what "they" say. The weight reduction seems to be the big thing and the most solid claim.
 

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Bummer about the end of the Lake City surplus brass. That's how I built my stockpile.

Is there any advantage to polymer cases other than weight and I suppose cost?
Yes, it cuts off a source of empty cases, much to the delight of the antis.
 

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Yes, it cuts off a source of empty cases, much to the delight of the antis.
Just wait for the pictures of those polymer cases stuck in the throat of a seabird. The enviro-loons will go nuts about all those plastic cases that will be around forever. Strange really, the Army was making a big deal about going to more eco-friendly projectiles and then go with a plastic case?
 

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My comments:

1. The first one looks Butt-Ugly and fragile.
2. The second one looks ungainly and cumbersome.
3. The third one looks better.
4. Any gun that can be switched from mag to belt-fed will probably not do a real good job in either configuration as opposed to one that is dedicated for one mission instead of two.
5. The caliber is a definite step-up; I just hope it is enough to "reach out there".
 
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