Agree with having conicals on-hand.
I've tested my .36 Navies on my local club's Texas-Star targets. 18 gr 3f & .380 RB results in a plate falling most, but not all the time. A non-perfect hit may leave a plate. Lee 125 grain conicals over the same charge fling them off with any ol' hit. I use RB for all but KDs and just keep a pouch with a dozen or so in my kit.(or, take a box of paper cartridges with conicals.
Sorry I don't have a source for ya. I do cast, but not prepared to make it a hobby business.
Slim