I am sure you can fine a mold cheaper than $150.00 but even if you can't if you shoot a lot it well be worth buying the mold. I have own several Pedersoli guns and they are all well made
Tape a dime to the Bore Butter and throw it as far as you can, that way when someone finds the Bore Butter they will also find the dime that is worth something. Clean with warm water and soap and then dry and lube bore with a good gun oil.
We have made Daniel Boone, Timothy Murphy , and a host of others into some kind of super hero's, they were just men that made a lucky shot once or twice.