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I am glad someone else is looking at this.
I am thinking the total water capacity is about 60.0 grains of water.
With a bullet seated to the bottem of the neck this would leave about 44.3 grains of water.
With bullet seated to .375 deep, you have about 49.9 grains of water.

this meanswith a 380 grain bullet and 40.0 gr of IMR 4064 you should get about 1,850 fps. at about 46,800 PSI.

With a 400 grain bullet I was thinking you could get 1,850 fps with 42.5 grains of IMR 4064. this at about 49,350 PSI.

I was thinking about a 24" barrel.

This cartridge should also be interesting with Black powder and paper patch bullets.

What do you think is the best bullet weight?
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