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Care to quickly summarize what your changes were and why? Looks like you took .357 SIG and lengthened the neck a bit–I assume to make more room for powder and/or longer bullets, so that you can replicate .357 mag ballistics in heavier loadings than 125 gr? There's also some changes to casehead dimensions, but I'm too small brain to understand the implications right away. Is it to withstand the higher pressures? How long is the new cartridge compared to original .357 SIG? Will it still fit in "small" pistol frames that are designed for 9mm and .40?