Chief Rick Posted April 3, 2019 Share Posted April 3, 2019 From the Marine Times https://www.marinecorpstimes.com/news/your-marine-corps/2019/04/02/ammo-for-the-marine-corps-50-caliber-is-getting-a-whole-lot-lighter/ Link to comment Share on other sites More sharing options...
The Original Lumpy Gritz Posted April 3, 2019 Share Posted April 3, 2019 Lets see just how well the 'plastic' holds up in a hot chamber.......... OLG Link to comment Share on other sites More sharing options...
Four-Eyed Buck,SASS #14795 Posted April 3, 2019 Share Posted April 3, 2019 Jams???????????? I would think case heads would be suspect to chipping Link to comment Share on other sites More sharing options...
Happy Jack, SASS #20451 Posted April 3, 2019 Share Posted April 3, 2019 I have fired the military experimental polymer cased rounds in 9mm, 223, 6.5, and 308. Not the 50 yet. The cases have brass bases. Link to comment Share on other sites More sharing options...
The Original Lumpy Gritz Posted April 3, 2019 Share Posted April 3, 2019 35 minutes ago, Happy Jack, SASS #20451 said: I have fired the military experimental polymer cased rounds in 9mm, 223, 6.5, and 308. Not the 50 yet. The cases have brass bases. How did the 223 or 308 deal with heat after sit'n in a hot chamber for a spell? Did you fire these in automatic weapons? OLG Link to comment Share on other sites More sharing options...
Sedalia Dave Posted April 3, 2019 Share Posted April 3, 2019 2 minutes ago, The Original Lumpy Gritz said: How did the 223 or 308 deal with heat after sit'n in a hot chamber for a spell? Did you fire these in automatic weapons? OLG The Hi-Tek polymer coating on bullets does not burn or melt when a coated bullet is dropped into a pot of hot lead. It just sits there till the lead heats up and causes the coating to crack due to the thermal expansion of the lead. Done right the polymers can be as tough as steel. Link to comment Share on other sites More sharing options...
The Original Lumpy Gritz Posted April 3, 2019 Share Posted April 3, 2019 11 minutes ago, Sedalia Dave said: The Hi-Tek polymer coating on bullets does not burn or melt when a coated bullet is dropped into a pot of hot lead. It just sits there till the lead heats up and causes the coating to crack due to the thermal expansion of the lead. Done right the polymers can be as tough as steel. Agree on the bullet coating. I have shot lots of poly-coated bullets over the years. Still-A polymer case, is a whole new deal. Even with a brass case head. OLG Link to comment Share on other sites More sharing options...
Happy Jack, SASS #20451 Posted April 4, 2019 Share Posted April 4, 2019 Lumpy, ran the 223 full auto with no problems but didn't let one sit in the chamber for more than a minute. Seemed OK. The 308 only ran semi but it also performed fine. Polymer is slower to transfer heat than brass so powder should heat up slower. I can see the weight savings on something like a 50, but it is still a crew weapon so not sure about the actual improvement in the field. I still feel the best use is subsonic as the case walls can be thick and get a good powder fill with the low charge weights. Link to comment Share on other sites More sharing options...
Utah Bob #35998 Posted April 4, 2019 Share Posted April 4, 2019 4 minutes ago, Happy Jack, SASS #20451 said: Lumpy, ran the 223 full auto with no problems but didn't let one sit in the chamber for more than a minute. Seemed OK. The 308 only ran semi but it also performed fine. Polymer is slower to transfer heat than brass so powder should heat up slower. I can see the weight savings on something like a 50, but it is still a crew weapon so not sure about the actual improvement in the field. I still feel the best use is subsonic as the case walls can be thick and get a good powder fill with the low charge weights. Exactly. Nobody is humping cans of 50 ammo. Link to comment Share on other sites More sharing options...
The Original Lumpy Gritz Posted April 4, 2019 Share Posted April 4, 2019 Helicopters still run the 50 for defense. Less weight could mean more ammo carried. OLG Link to comment Share on other sites More sharing options...
Gunner Gatlin, SASS 10274L Posted April 4, 2019 Share Posted April 4, 2019 7 minutes ago, The Original Lumpy Gritz said: Helicopters still run the 50 for defense. Less weight could mean more ammo carried. OLG ...and fuel economy in air and ground vehicles - GG ~ Link to comment Share on other sites More sharing options...
Badlands Bob #61228 Posted April 4, 2019 Share Posted April 4, 2019 Lighter is better if it works reliability. I wonder what the cost difference is? Should be cheaper, but not likely. Link to comment Share on other sites More sharing options...
Chief Rick Posted April 4, 2019 Author Share Posted April 4, 2019 2 hours ago, Badlands Bob #61228 said: Lighter is better if it works reliability. I wonder what the cost difference is? Should be cheaper, but not likely. Article didn't list costs but... MAC LLC, a company out of Bay Saint Louis, Mississippi, is the company that will likely receive the sole source contract unless another company can show they meet the requirements and can do a better job before the federal deadline in a couple of weeks to deliver an estimated quantity of 2.4 million cartridges for the Corps over three years. Link to comment Share on other sites More sharing options...
Sedalia Dave Posted April 5, 2019 Share Posted April 5, 2019 Besides the weight savings the polymer cases cannot be salvaged and used by our enemies to be reloaded or melted down to make other cartridge cases . IIRC this was one of the big selling points for polymer cases. Link to comment Share on other sites More sharing options...
Marshal Mo Hare, SASS #45984 Posted April 5, 2019 Share Posted April 5, 2019 Are they delivered to USMC all linked up and ready to go? Link to comment Share on other sites More sharing options...
Dutch Nichols, SASS #6461 Posted April 5, 2019 Share Posted April 5, 2019 I have fired 556 and 7.62 and the cases come out mildly warm but no way would you call them hot that said one would think chambers will run cooler so “cook offs” seem less likely 556 and 762 military ammo is being sourced from a firm here in Texas not sure about the 50 though Link to comment Share on other sites More sharing options...
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