It's been tried with some of the lower pressure shells like .38 special.
There was a company back in the 1980s when I was in college that offered them. Supposedly you didn't need any tools to reload them. You did need the special heeled bullets, though. You couldn't use regular bullets.
A company made plastic cased .223 FMJ ammo a while back. The owner of my LGS showed me one of these rounds in his "oddities" collection. I don't think they are produced any more.
As a reloader ....that picked up a few thousand cases off the floor of my local range on Sunday ...I am strictly opposed to using plastic cases in handgun loads ...
but looking at my reloading tables for my shotshells ...12ga, 20ga, 28ga and .410's ....the pressures are mostly between 10,000 and 12,500 psi...
even cartridges like 9mm run 28,000 - 33,400 psi ...
Plastic is a pretty generic thing / and there are some plastics that might work ...but high end plastics may not be cheaper than brass. Shotshell hulls that we typically use these days ( that I reload 20 or more times )are still very thin ...and even the most durable of them, like the Remington STS or Nitro hulls, will not hold up to those kinds of pressures. I know pressure in a .45 acp are lower ....but not low enough ....
very well done, newbie! you're obviously not new to guns.
i'll be looking forward to hearing more from you
seriously, there are plastic bullets, plastic cases and complete plastic rounds. all are low pressure practice rounds at this time.
i'm sure they would hurt like hell if you were shot with one, but unless shot in the eye, or at extremely close range, they wouldn't be disabling.
jmho
Used some 38 specials with plastic cases back in the late 80's. It worked as intended. The cases were quite a bit thicker than its brass brethren. They were waddcutters if I recall.
I used to have a small collection of various .38 Special plastic cases. Over time, they became very brittle, though, and crumbled with the slightest touch. I threw them all away, but there were several brands, several different loads (printed on the plastic), and a few different shot shells.
I still have a couple plastic 9mm Luger and .44 Special cases laying around, ...somewhere...