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And the chamber pressures for the .380 and .45 ACP are much lower too so you can filter out the pictures of those calibers. The 9mm chambers have little unsupported area and have a max pressure of 35,000. The .40S&W also has a max pressure of 35,000 but bulging doesn't happen because it wants to. It happens because it has to due to simple physics - there's nothing to support that area.
I use a Dillon case gauge for all my finished rounds, and the ones that don't drop in freely are the ones with the bulged cases, causing me to disassemble those rounds and either successfully resize the brass or toss it in the recycle bin.
I use a Dillon case gauge for all my finished rounds, and the ones that don't drop in freely are the ones with the bulged cases, causing me to disassemble those rounds and either successfully resize the brass or toss it in the recycle bin.