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For lower pressure ammo like handguns, shotguns, and maybe a select few rifle rounds I wouldn't be too opposed to it. Would certainly be interesting if some of the ammo costs could be reduced by 20-30% by moving away from more involved/expensive metalic cases.
For high powered rifles and for making accurate handloads I'd much prefer to stick with and work with brass casings.
123whisper, you ever seen how the extruded casings are made(wouldn't surprise me if you are a 300Whisper fan as your nickname suggests)? Wouldn't surprise me if very little actual machining goes into making a metalic case, pretty much everything can be formed by high pressure drawing and forming. More involved a process than using a synthetic injection molded part probably but we all know brass cases have their uses.
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I have seen how cases are made, true, not much machining, maybe just primer pockets? Or even that? But if you HAD to make cases, such as in they were not available due to some reason, everyone thinks of the oft-meantioned SHTF, you would have to machine cases, wouldn't you? It is possible to do injection molding on a small scale at home. I can get a link for a book I need to order, if you want. I am not on my home comp but I could get it later if you want.
Brass for accurate handloads yes, for most rifle cases yes. Hand guns could use plastic, and so could rifle cases with low pressure. A person could always try it! A blowback 9mm could easily and safely be tried.
Yes, when I did the name, I did/do like the whisper series. Ubber cool, the best suppressed cartridge for AR/M16 series. I don't have one, heck I am still working on getting an AR. But I am young and hopefully it won't take long, and shooting will still be an available sport by the time when I get the money.