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cliffhanger: Lots of folks successfully load .40s, with no problems. However, I'm pretty heavily invested in 9mm and .45 (and variants on that platform). It's JUST my personal opinion that the .40, due to its high pressure and short case for the caliber it is (compared, for example, to a 10mm) leaves very little room for that old nemesis, human error. Just a little setback, or just a little too much powder, particularly if you're using a fast powder, can bring disastrous results.
The 6o'clock bulge is the bulge the brass makes when fired, when that brass is subjected to high pressure and isn't supported @ the 6 o'clock position of a pistol's chamber. Very few, if any, pistols offer total case support.
If I were going to reload 10mm bullets, they'd be for 10mm cases. Well, I would load .400 Cor-Bon, which uses 10mm bullets, but the pressure is much lower than on a .40.
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