I sure hope you have a fully supported chamber for those bullets. I started reloading with the 40SW and 231 also and started doing a literature search to locate a cause for the 'kaboom' phenomena. What I have gathered from numerous articles is that pairing a high pressure round such as the 40SW with a fast powder can become a recipe for disaster especially in semiautos with unsupported chambers! I am not an experienced reloader by any means ( only done this since 97) but I did shoot a Glock 23 and then a 35( unsupported chambers)and noticed quite a bit of case bulging. So it seems the recipe for disaster is 40SW pressures, FAST powders like 231, lead bullets ( in uncleaned breech causes lead buildup pushing the cartridge out further from the breech exposing more of the web of the brass and multiple reloads on old brass ( > 6 ). I shoot IPSC and have to shoot major power/ hot loads in 40 to make major. When I asked around to the A/master class shooters shooting Glock 40's they appreciated my same concerns and suggested I reload shells 6X max, go to slow powders ( I now use VV340), and go to full length brass sizing which I do. Since I have switched to the slower powder I have already noticed much less bulging on my cases with the same power factor. Next I will go to an aftermarket barrel like the Barsto to fully support the cartigde.
Keep the 231 for 45 ACP but go slow with the 40. Good luck and stay safe...
TR
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TR
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