.25 slug mold

I'm a new member but have a .22 break barrel and mostly shoot powder burners. But I have 2 airforce .25s on the way. I do a lot of casting for my .357 mag and always put a box fan sucking the air away from my casting station. (Plywood on saw horses in the back yard) but it makes a big difference. Don't put it blowing over the station set it on the back side and have to suck the air away.