Nov 6, 2009 · 38/357 relationship has little bearing on .40/10 or 9x19/9x21/9x23 unless shot in revolvers wherein moonclips provide headspacing requirements. Sounds like if I want a bigger, badder auto I need to go 10mm. If 9x21 can't load a 158gr minimum weight bullet, I don't think I'm …

Jun 25, 2007 · 9x21 will not chamber in a 9x19. It's 2mm too long. 9x19 will chamber in a 9x21. However, since both rounds headspace on the case mouth, there will be nothing to support 9x19 in a 9x21 chamber. The only think holding the 9x19 in place would be the extractor. The result will be unreliable ignition and probably poor accuracy.

9x21 is equivalent to the 9x19/9mm Luger/9mmParabellum and is designed to circumvent laws in countries that prevent civilian ownership of military ammunition and firearms in military calibers. Although the case is slightly longer than the 9mm Luger case, the bullet is typically seated such that the OAL is identical to 9mm Luger rounds.

Oct 18, 2004 · The 9x21 was meant for use in places like Italy where it is not legal to own 9x19 GUNS. The cartridges are not interchangeable. It will not chamber in a 9x19 and was not designed until many years after your Radom was built. If you want to shoot your Radom on what my friend calls "ceremonial occasions" get standard 9x19/Para/Luger ammo for it.

Mar 12, 2000 · You can safely use 9x19 data (stick to loads near max) in your 9x21. Good cartridge, just a longer case than the 9x19, I've loaded them side-by-side, and with the same powder charges I've gotten similar performance.-----"All my ammo is factory ammo"

Oct 29, 2002 · 9x21: Originated in the 1960s or 70s as a rule beater for sale in Italy where private ownership of military calibers like 9x19 is banned. The case is 2mm longer than 9mmP, the bullet is seated 2mm deeper, same OAL for the same magazines. The guns are the same except for the chamber. The ballistics are the same except when hot loaded for IPSC.

9x21 is equivalent to the 9x19/9mm Luger/9mmParabellum and is designed to circumvent laws in countries that prevent civilian ownership of military ammunition and firearms in military calibers. Although the case is slightly longer than the 9mm Luger case, the bullet is typically seated such that the OAL is identical to 9mm Luger rounds.

Jul 6, 2007 · I am convinced the longer 9x21 case provides more time for powder burn due to increased case neck tension from its longer case). I often use compressed loads, particularly for social ammo, to preclude any possibility of bullet set-back, which IMO would be catastrophic at these elevated Screw-SAAMI pressures.

Jul 2, 2007 · Cartridge OAL of both 9x19 and 9x21 is the same! the only difference is 9x21 has a longer case but the bullet is seates to the same depth as in 9mm. So the powder space of 9mm and 9x21 will also be the same, and the pressures should be the same as well.

Sep 16, 2010 · The benefits to 9x19 is that brass is really cheap. There are approx. 25% of open divisions super squad now shoot 9 major. .38 super auto or it's variants 9x21 or 9x23 is expensive but can be reloaded upwards of 20x. That brass is thicker & tapered.(lapua, TJ, Supercomp are even thicker) Production is scored minor, so many reload mousefart loads.