New .308 Win./7.62 x 51 Ammo Coming Soon
- Thread starter hps1
- Start date
- Status
Well, I thought it was until I found:
https://www.thetruthaboutguns.com/ammo-review-pcp-polymer-308-winchester-ammunition/
Regards,
hps
https://www.thetruthaboutguns.com/ammo-review-pcp-polymer-308-winchester-ammunition/
Regards,
hps
Last edited:
Ah, should have noticed the price.
I got to wondering where the good picture came from and googled plastic cartridge cases and guess what? Joke's on me, PMC experimenting with it currently.
See link above.Regards,
hps
Sounds reasonable. Military always looking for ways to lighten the load on infantry.
The report @ above link mentions six of the 20 rounds tested misfired in test rifle even after 2-3 attempts. Looks like a light strike on primers to me. Based on the fact that he mentioned firing a large number of conventional rounds w/o issue, makes me wonder if shoulder was pushed back too far, creating excess headspace on the six cartridges or perhaps the plastic case compressed upon firing pin impact, cushioning the blow???
Looks like they have a ways to go.
Regards,
hps
ReloaderFred
Member
These have been around in .223 for a number of years. They were giving away samples (unprimed and no powder) at the SHOT Show probably 7 or 8 years ago. My shooting partner ended up buying a case of the stuff, and I've got a box of it around here somewhere that he gave me. He fired a couple of boxes of it and didn't have any problems in one of his AR's, but there wasn't anything better than brass cased, so he just put them away for "whenever", whatever that means.
Now, if you had some samples of Trounds, those would be worth something....
Hope this helps.
Fred
Now, if you had some samples of Trounds, those would be worth something....
Hope this helps.
Fred
Yea, I remembered the .223 ones Fred mentioned, so I knew it had been done.
627PCFan
Member
Wouldn't they melt and get goey after feeding in hot chambers?
There have been a number of attempts to make plastic case ammuniton. The case head has to be brass or steel, as it is the pressure vessel, the trick is to make the case such that it does not pull apart on extraction, which is what probably why this went away
It looks as though the metallic pressure vessel part of the case is woven into the polymer
this is on the market. Have not tried it, but others have, I have not read howls.
I do want to ask you Hatcherites, those of you who insist that the case must grip the chamber, and it if does not, you are increasing bolt thrust, to explain how these cases work without damaging the mechanism. The only part of the case that is metal is the back part, and if you stick the plastic front in the chamber, the case will pull apart. Obviously the front end is not doing its duty, by sticking to the chamber, so these cases must increase bolt thrust. Or do they?
It looks as though the metallic pressure vessel part of the case is woven into the polymer
this is on the market. Have not tried it, but others have, I have not read howls.
I do want to ask you Hatcherites, those of you who insist that the case must grip the chamber, and it if does not, you are increasing bolt thrust, to explain how these cases work without damaging the mechanism. The only part of the case that is metal is the back part, and if you stick the plastic front in the chamber, the case will pull apart. Obviously the front end is not doing its duty, by sticking to the chamber, so these cases must increase bolt thrust. Or do they?
Grumulkin
Member
Why wouldn't the front end be doing its duty? On firing the pressure increases forceing the case walls against the chamber just like with a brass case. The only difference might be the coeficient of friction of the case walls on the chamber and after firing the case walls may recoil more than with a brass case.
- Status
Similar threads
