I do not have a .40 but I have read into it quite a bit. I can't recomend a bullet weight but I can tell you to please be careful when reloading the 40. It operates at a very high pressure and most of the gun makers do no have chambers that fully support the rear of cartridge by the feed throat. 40's are known to buldge near the rear of the case, just make sure you check your brass carefully and do not overload the 40, it is already a "hot" load with high pressure to start with. I load .45 almost daily and may be able to answer any general questions, sorry no one out there is responding. Try posting this in the reloading section.