SlowGun,
KciH is giving you the straight scoop.
There are many sources of cast bullets out there, if you want to buy them. Maybe even try some from the "Creeker" on this site (I just ordered some, never fired any so this is not any kind of "promo").
You could probably use some swaged bullets, but you would need to keep the velocity down to .44 Special, or maybe even a little lower, to keep the leading problem down. I'd go with some harder cast so you can get the benefit of the caliber you paid for. Just my $0.02 worth.