Sounds like the revolver you have is chambered in the 32 Colt cartridge that uses heel type bullets. You will need a special crimp tool for those:
https://oldwestbulletmoulds.com/shop...colt-crimp-die
Bullets are pretty cheap - maybe these would work for you?
https://oldwestbulletmoulds.com/shop...n-heel-bullets
As someone else said, just fill the cartridge 3/4 of the way so the bullet will compress the black powder a little.