This is a absolute load of bullshit, plastic also takes away heat, but also at the same time where do you think this magic heat is going? The only thing you have to cope with is the contact between it and the hammer and bullet seat for cooling, but arguably any other form of cooling will do it just as effectively, and the plastic still absorbs heat too, just not as fast.
Have you ever considered measuring the cooling effect yourself? Personally I don't see the point as material science moves onwards.
metals are very good conductors of heat. Brass case heats up and then transfers the heat into the action quickly. With plastic you don't have as good a transfer medium
I guess that depends on the properties of the polymer.
Brass takes out hear, but it also conducts heat from the burning powder directly into the chamber.
If the polymer insulates against heat, even a little it would probably balance out.
CASELESS ammo directly puts the heat source on the surface of the chamber.
Metallic cased ammo conducts heat, but there's some resistance to heat transfer so it acts as an insulator. So some heat is ejected out the firearm.
Polymer cased ammo is a much better insulator, actually minimizing heat transfer to the chamber.
Good insulators tend to have low heat capacity. There is more heat energy getting removed from the gun in a brass case than a polymer case. Where is that extra heat going? It's just going to end up in the barrel anyway and make its way back to the chamber. Also consider that this ammo was developed in parallel with the RM277... which has the capability to switch between open bolt and closed bolt. Do you think they revived this idea for the hell of it even though no one's bothered since the FG42?
You know there's independent videos where people point thermal cameras at their guns and see that the polymer cases heat up guns less in all areas and after multiple rounds, right?
>Precision molding allows for the manipulation of internal case geometry, resulting in a more efficient powder burn
the effect is under <1% with unconventional geometries and <0.2% with conventional
"unconventional geometries" refers to things that are not even cartridge shaped if its unclear
Nogunsgay here, I used to think that all bullets filled to the brim with gun-powder, so do most bullets sound like salt shakers when you move them right next to your ear?
You have to make your complete cartridge fit a existing specifications or your perfectly crafted, Space efficient creation wont have a existing gun to shoot it out of.
9mm was built to the specifications the German military wanted 100 something years ago and we simply work within this size specification to get the performance we like.
>doesnt know how ammo compatibilities work
and there is already .380
and for subs that are a bit heavier than .380, 9x19 is almost perfect. high PSI allows for fast burning powder (quieter) and standard 9x19 guns typically have a relatively fast twist rate
Not all powder/ propellant is the same. Having extra space in the cartridge gives you the opportunity to try/ use different powders and powder amounts instead of having to design a new/ different cartridge. From a logistics standpoint it makes perfect sense to have extra space in your cartridge.
Pressure and volume are really closely related. A tiny amount of powder in a tiny space will produce a lot more pressure than the same amount of powder in an spacious case even if it's still a relatively low fill rate.
I don't know shit about pistol cartridges, but for rifles more often than not the best loads are somewhere between nearly 100% full to slightly compressed. People who reload for accuracy choose powders to achieve this, intersecting with hitting near their maximum pressure with a given bullet seated to a given depth.
Being full ensures more consistent burn. When there is air space in the cartridge it can affect how the burn propagates.
On the extreme end really undefiled cartridges, like big centerfires loaded subsonic using powders not designed for that, pressure curves are all over the place round to round. The same load can be almost a squib in one round to a detonation on the next.
Handgun powders being a lot faster and more volatile and in a smaller case make case fill and powder position less important. Lots of the most accurate loads are less than half a case full of titegroup, especially in revolvers where having all the powder burnt by the time the bullet gets to the cylinder gap is a big advantage in terms of consistency.
I don't know shit about pistol cartridges, but for rifles more often than not the best loads are somewhere between nearly 100% full to slightly compressed. People who reload for accuracy choose powders to achieve this, intersecting with hitting near their maximum pressure with a given bullet seated to a given depth.
Being full ensures more consistent burn. When there is air space in the cartridge it can affect how the burn propagates.
On the extreme end really undefiled cartridges, like big centerfires loaded subsonic using powders not designed for that, pressure curves are all over the place round to round. The same load can be almost a squib in one round to a detonation on the next.
Behold my latest utterly moronic idea. >3d print a modified shotgun shell >Design said shell so instead of a primer it has a tiny bit of copper wire and is fully polymer >Instead of a traditional firing pin, uses a piezoelectric switch >Black powder because you can make it yourself >Barrel is a metal pipe that can just be replaced if it gets too fouled with black powder, low pressure of shotguns making tolerances easier for 3d printed parts. Could also have a 3d printed barrel version, but honestly I feel like just a plain old steel pipe since it's smoothbore would be better than trying to make a disposable printed barrel, (however as it's black powder a disposable barrel saves you needing to clean it) >3d printed gun with a smoothbore disposable barrel using a metal pipe or something using self-made black powder printed shells that don't need primers, only part you'd not be able to replace easily is the piezoelectric switch
It's plastic though, the strongest material known to man. I wouldn't worry about it.
plastic, the strongest metal known to man. who would win, plastic powder* or plastic casing?
*nitrocellulose = plastic
what am i supposed to be mad at
You are supposed to reject progress of any kind. Change is bad you see
Can confirm. I changed once and it was awful.
>t.
>You are supposed to reject progress of any kind. Change is bad you see
Not always but quite often it is as often as it is not.
nobody ever wants to be changed. but having been changed, nobody ever wants to go back
If we're progressing to battle rifles, then I'm holding out for when we progress to bolt actions, then flintlocks
Bolt action is peak firearms, semiauto was a mistake.
progress for progress sake be it good or bad is BAD. just like leftism
Compressed loads are fairly common with slow smokeless powders. With black powder they are standard.
>he uses plastic casings
moron
We should have switched to polycase.
Metal cases have the rather convenient side effect of taking a lot of heat with them out of the gun.
You know what also does that?
Adding a block of fins to the side of the gun.
Ah yes, just what everyone has been asking for: blocks of fins bolted to their rifles.
nice fuddlore, they transfer more heat into the chamber to begin with
Not that anon but can you explain how burning powder inside a case produces more heat than burning that same powder without a case?
>No case
It's a plastic case. This isn't caseless ammunition.
Got you, so the plastic is a better thermal insulator than brass, makes sense.
This is a absolute load of bullshit, plastic also takes away heat, but also at the same time where do you think this magic heat is going? The only thing you have to cope with is the contact between it and the hammer and bullet seat for cooling, but arguably any other form of cooling will do it just as effectively, and the plastic still absorbs heat too, just not as fast.
Have you ever considered measuring the cooling effect yourself? Personally I don't see the point as material science moves onwards.
metals are very good conductors of heat. Brass case heats up and then transfers the heat into the action quickly. With plastic you don't have as good a transfer medium
Call out to your mum to explain how potholder or oven cloths work and what heat transfer rate is.
moronic frick
tell me, how exactly do you see heat from the barrel going back towards the case in any significant amount before it flies away?
I guess that depends on the properties of the polymer.
Brass takes out hear, but it also conducts heat from the burning powder directly into the chamber.
If the polymer insulates against heat, even a little it would probably balance out.
CASELESS ammo directly puts the heat source on the surface of the chamber.
Metallic cased ammo conducts heat, but there's some resistance to heat transfer so it acts as an insulator. So some heat is ejected out the firearm.
Polymer cased ammo is a much better insulator, actually minimizing heat transfer to the chamber.
Good insulators tend to have low heat capacity. There is more heat energy getting removed from the gun in a brass case than a polymer case. Where is that extra heat going? It's just going to end up in the barrel anyway and make its way back to the chamber. Also consider that this ammo was developed in parallel with the RM277... which has the capability to switch between open bolt and closed bolt. Do you think they revived this idea for the hell of it even though no one's bothered since the FG42?
That ugly chode suppressor really ruins the look of the gun.
You know there's independent videos where people point thermal cameras at their guns and see that the polymer cases heat up guns less in all areas and after multiple rounds, right?
>where does that extra heat go?
Mostly out the muzzle along with the gasses like the rest of it
Polymers pyrolyses (and melts) so they're far better than any metal, specific heat capacity isn't everything.
>Where is that extra heat going?
Pushing the bullet out the barrel instead of getting absorbed (wasted) by the chamber.
progress is bad
Wasn't this debunked that polymer version was the training ammo ?
The same which all goontubers tested?
This is a powder mafia conspiracy. They want us to use twice the powder for reloading.
>Precision molding allows for the manipulation of internal case geometry, resulting in a more efficient powder burn
the effect is under <1% with unconventional geometries and <0.2% with conventional
"unconventional geometries" refers to things that are not even cartridge shaped if its unclear
Who let Bubba get on the design team?
Nogunsgay here, I used to think that all bullets filled to the brim with gun-powder, so do most bullets sound like salt shakers when you move them right next to your ear?
whats the point of having the empty space in the casing? why not just shrink the casing down to the powder size you want?
You have to make your complete cartridge fit a existing specifications or your perfectly crafted, Space efficient creation wont have a existing gun to shoot it out of.
9mm was built to the specifications the German military wanted 100 something years ago and we simply work within this size specification to get the performance we like.
That's a shitty argument. 9x21 is a thing, why couldn't 9x16 be a thing?
>doesnt know how ammo compatibilities work
and there is already .380
and for subs that are a bit heavier than .380, 9x19 is almost perfect. high PSI allows for fast burning powder (quieter) and standard 9x19 guns typically have a relatively fast twist rate
Not all powder/ propellant is the same. Having extra space in the cartridge gives you the opportunity to try/ use different powders and powder amounts instead of having to design a new/ different cartridge. From a logistics standpoint it makes perfect sense to have extra space in your cartridge.
Congrats you have invented .40
Pressure and volume are really closely related. A tiny amount of powder in a tiny space will produce a lot more pressure than the same amount of powder in an spacious case even if it's still a relatively low fill rate.
Handgun powders being a lot faster and more volatile and in a smaller case make case fill and powder position less important. Lots of the most accurate loads are less than half a case full of titegroup, especially in revolvers where having all the powder burnt by the time the bullet gets to the cylinder gap is a big advantage in terms of consistency.
what
Yeah
I don't know shit about pistol cartridges, but for rifles more often than not the best loads are somewhere between nearly 100% full to slightly compressed. People who reload for accuracy choose powders to achieve this, intersecting with hitting near their maximum pressure with a given bullet seated to a given depth.
Being full ensures more consistent burn. When there is air space in the cartridge it can affect how the burn propagates.
On the extreme end really undefiled cartridges, like big centerfires loaded subsonic using powders not designed for that, pressure curves are all over the place round to round. The same load can be almost a squib in one round to a detonation on the next.
Can those be reloaded?
Sorry nerds I can't hear you over my pissin hot plastic loads
Basado.
Ive been playing around with blackarc bimetal cases.
They are pissin hot
They are rad.
How does polymer hold up to repeated reloading?
Behold my latest utterly moronic idea.
>3d print a modified shotgun shell
>Design said shell so instead of a primer it has a tiny bit of copper wire and is fully polymer
>Instead of a traditional firing pin, uses a piezoelectric switch
>Black powder because you can make it yourself
>Barrel is a metal pipe that can just be replaced if it gets too fouled with black powder, low pressure of shotguns making tolerances easier for 3d printed parts. Could also have a 3d printed barrel version, but honestly I feel like just a plain old steel pipe since it's smoothbore would be better than trying to make a disposable printed barrel, (however as it's black powder a disposable barrel saves you needing to clean it)
>3d printed gun with a smoothbore disposable barrel using a metal pipe or something using self-made black powder printed shells that don't need primers, only part you'd not be able to replace easily is the piezoelectric switch