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I never believed their was any magic in the .356TSW cartridge. A sanctioning organization disallowed 9X19 as a Major caliber due to safety concerns. The 356TSW was created as a rule beater, so Team S&W shooters could use 9MM size guns and their high capacity magazines in competition and be scored Major. This, because 356TSW was not technically the same as the disallowed 9X19MM Major, and there was no SAAMI spec at the time for the newly created round. Politics were involved, and interest in the 356TSW soon died.

No magic, and no free lunch. The 356TSW is the same bore size, same case and bullet diameter, same OAL, and fits in the same magazines as common 9X19MM. Of course, if the goal is to load a very light bullet,say 90 grains or less, to max velocity, I guess the longer case would achieve that as it would allow loading those stubbly little bullets to 1.160". But with more normal weight, 115 grains or more bullets used, if one wants to load the same bullet, to the same velocity, to the same OAL in the 9X19MM case, you can do so and pressure will be the same as with the TSW round. Now if the TSW case head is indeed heavier than 9X19, it has less case capacity than 9X19, and pressures will be higher for any given load. So nothing at all wrong with .356TSW/9X21.5MM, but no magic either....ymmv
 
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