See that Starline sells .40 super brass. Did I miss something? Never heard of it. Wouldn't a .40 super.....be a .......10mm?

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S&W Accumulator

.40 Super - Wikipedia, the free encyclopedia

Yes, 45super case necked down to 40 cal., the velocities are very simular to 10mm from what I have seen. The edge may actually go to the 10mm for top performance. I opted for the 10mm cartridge and guns since early 1990 with a S&W1006.

I also managed to ge the 9x25Dillon conversion for my S&W1006, this is the 10mm necked down to 9mm and runs about 250-300+ fps more than the 357Sig using the same bullets.