Makes sense for handguns, tbh. Get a little more mass at minimal loss of velocity. You'd probably see a general increase in energy in the super short barrels, which is all super useful with how poorly the 5.7x28 performs.
You should be able to fit 7.62 caliber projectiles, maybe. So this would be like 30 super carry magnum, probably in a more conventional browning locked breech. I don't know if it would work but it's interesting enough to try.
>You should be able to fit 7.62 caliber projectiles, maybe.
Not, not even maybe. 7.62mm projectiles are really 7.82mm (at least anything based on a .308 projectile is), while 5.7x28 has a base diameter of 7.95mm. If you made it a perfectly straight walled case (terrible for extraction), that would leave you 65 microns worth of case mouth thickness, or about 2 thou if you're into imperial. That's roughly the size of a human hair, so not gonna happen. There's a reason 7mm Penna is, well, 7mm.
If you ignore the rim, .38 Super is roughly the same size at it's rim as the 9mm Luger family. That means with a .32 bullet, you would end up at (roughly) 7.62 Tokarev. As for the .25, it would be somewhere roughly between .22 TCM and 6.5 CBJ, probably a bit more powerful than either because .38 Super implies a 1911 frame, which allows for increased COAL.
No, because 7.5 FK exists. Why the hell would you want to frick up the one good thing about 5.7(velocity) by giving it a heavier projectile? Just make a gun in .22TCM, it’s better in almost every way. Hell, make something modern in x25 Tokarev, you’ll get the same benefits as a 5.7 upsize. The development of that cartridge would be better spent elsewhere.
Straightwall case means extremely poor extraction to the point that no gun could ever be made reliable. Instead of adding a slight taper like every other cartridge ever, they lube the cases with powdered plastic.
>Straightwall case means extremely poor extraction to the point that no gun could ever be made reliable
Couldn’t that be fixed with a fluted chamber? I know the older roller delayed blowbacks could basically operate with the extractor removed, but idk if that scales down to handguns very well
Why? For what purpose? And why not just adopt Tokarev in that case?
Makes sense for handguns, tbh. Get a little more mass at minimal loss of velocity. You'd probably see a general increase in energy in the super short barrels, which is all super useful with how poorly the 5.7x28 performs.
>Would necking 5.7 up to 7.3 make sense?
No, because 7.3mm does not fit.
https://en.wikipedia.org/wiki/7mm_Penna
Yeah, you wouldnt need such a long barrel for optimal performance. Also heavier bullets would be possible. Better hollow points etc
What if you did 7mm or 6.5, but with rifle projectiles? That could be fun.
>What if you did 7mm or 6.5, but with rifle projectiles?
Would not be fun, those rifle bullets would not leave any room for powder.
Try 3N37
Still not a lot of room.
No because then it just becomes a straight wall 7.3mm anemic cartridge.
No, you'd be taking away any ability to fragment in flesh or penetrate armor and "muh wound channels" fans would be out of a job.
its called 7.5 fk
You should be able to fit 7.62 caliber projectiles, maybe. So this would be like 30 super carry magnum, probably in a more conventional browning locked breech. I don't know if it would work but it's interesting enough to try.
>You should be able to fit 7.62 caliber projectiles, maybe.
Not, not even maybe. 7.62mm projectiles are really 7.82mm (at least anything based on a .308 projectile is), while 5.7x28 has a base diameter of 7.95mm. If you made it a perfectly straight walled case (terrible for extraction), that would leave you 65 microns worth of case mouth thickness, or about 2 thou if you're into imperial. That's roughly the size of a human hair, so not gonna happen. There's a reason 7mm Penna is, well, 7mm.
>Would necking 5.7 up to 7.3 make sense?
They already did that in the 1900's
What about .38 super with a .32 or .25 bullet?
Actually, 9x23, since it's higher pressure.
If you ignore the rim, .38 Super is roughly the same size at it's rim as the 9mm Luger family. That means with a .32 bullet, you would end up at (roughly) 7.62 Tokarev. As for the .25, it would be somewhere roughly between .22 TCM and 6.5 CBJ, probably a bit more powerful than either because .38 Super implies a 1911 frame, which allows for increased COAL.
I was thinking it'd be neat if there was something like a shrunken 9x25 that would have a fair bit more power than .22 TCM or similar.
No, because 7.5 FK exists. Why the hell would you want to frick up the one good thing about 5.7(velocity) by giving it a heavier projectile? Just make a gun in .22TCM, it’s better in almost every way. Hell, make something modern in x25 Tokarev, you’ll get the same benefits as a 5.7 upsize. The development of that cartridge would be better spent elsewhere.
No because it doesn't fix the deck d biggest problem with 5.7, which is the moronic case geometry.
>moronic case geometry
What do you mean by this?
Straightwall case means extremely poor extraction to the point that no gun could ever be made reliable. Instead of adding a slight taper like every other cartridge ever, they lube the cases with powdered plastic.
>Straightwall case means extremely poor extraction to the point that no gun could ever be made reliable
Couldn’t that be fixed with a fluted chamber? I know the older roller delayed blowbacks could basically operate with the extractor removed, but idk if that scales down to handguns very well
Neck it down to 4mm