I have to wonder how loud those are
With no powder, how do they propel? If it's no powder, how loud could it be? The difference in pressure wouldn't be that great. Plus .45 is a natural subsonic round...
If your into reloading I've had good success with Paper Patched Glue Sticks for my 45.... Let me know if your interested and I can fill you in on the process.
Other wise Midway has the Rubber Bullets you can buy and relaod too as an option.