Re: 7.65 mm Parabellum cartridge
The 7.62 Tokarev doesn't fit in, literally, it's too long. The original cartridge behind all this was the 7.65 Borchardt. Mauser used a hotter loading for the 7.63 Mauser. Herr Luger shortened it to make the 7.65 Parabellum. Shortening was required to make room for the recoil spring in the grip. The Soviets made some minor diminsional changes in the 7.63 Mauser to come up with the 7.62 Topkarev, but it has the same overall length as the Mauser and is too long to go through the Luger magazine well. There are a couple of other obscure cartidges based on the 7.65 Borchardt.
If you roll your own, it's easy to heat up the 7.65 Parabellum, just dump in more powder. Exactly how much is something I have yet to determine. I do know there is a lot of room to spare as far as pressure goes. Just upping it to the same pressure levels as the current 9mm loadings should do the job. There is a mytery in the question of how we came to have such wimpy factory loads.
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