The conical may or may not allow 20 grs under it. I usually shoot 15 grs for the conical and 20 fro the RB. I use a lube wad for the RB but not the conical.
LEE makes a nice double cavity aluminum mold for the .380 ball and the 130gr conical. If you want to go volume you can get a 0000 buckshot (.380" dia.) mold for about $40 that casts 10 balls per pour (no sprue cutter, balls are not perfect spheres [there is an "equatorial" flat area of about 1mm where the mold haves join] but very serviceable ammo) from buckshotmold.com. Or you can go delux and get a biglube.com mold that will throw 6 very precise .380" RBs per cast.
With over 15 perCUSSIN' revolvers, I've been called the Imelda Marcos of cap & ball.
SASS#3302 (Life), SASS Regulator, NRA (Life), DGB#129
Wolverton Mtn. Peacekeepers (WA), former Orygun Cowboy (Ranger, Posse from Hell)