I'll start by saying i do have slug permission on my ticket.

at my home range, I cannot use a shotgun unless it is loaded with black powder and firing a slug. a few guys use 410's there. but i want to use my 1897 pump action. now googling doesn't seem to turn up much at all, apart from just reloading standard nitro shells to blackpowder loaded shot shells. nothing really about slugs.

anyone have anything to offer? even simple like best way to crimp etc

the shotgun is a nitro shotgun, but the range will not let me use nitro. i was told that initially it was just a 'NO!' to shotguns being used at the range, but our club pushed and got BP slug shotgun to be allowed. and only this as it is essentially the same as using a blackpowder musket.

can anyone give me any guidance on loading up slugged BP shells please?