My son just bought a FNH FNP-40 (.40 S&W). We would like to reload for it but have not as yet bought reloading dies. I was looking through some of my loading manuals and both the Lyman no. 49 and Hodgdon's on-line loading data said not to use the data for handguns of this caliber that did not fully support and enclose the cartridge because the cases may rupture and damage the shooter, the gun, a bystander, or all of the above. Unfortunately neither data source mentioned any specific handguns. I had heard from some shooters at my club range that you should not reload for Glocks as they could experience this problem. It appears that a loaded round goes fully into the barrel of the FNP, however I don't know if this was a true test of cartridge support. Is it safe to reload for the FNP? Obviously I'd like to know this before we invest in dies, components, etc.
My son is also considering purchasing either a small or medium frame Glock or a S&W Sigma in 9mm Luger. Would either or both of these be susceptible to the problem described above? I have also heard that you are not supposed to shoot lead bullets in a Glock. Is this true? We shoot mostly lead bullets to keep down on the cost of shooting and would probably want to avoid purchasing a gun in which it would not be possible or feasible to shoot lead bullets.
Thanks in advance for any information and/or advice you can provide.