heavy cast bullet in .380?

[Mr. 16 gauge]

Hello all;
I shoot a Walther PPk/s in .380, and I reload for the caliber. Seeing as how I don't shoot it too often (as compared to some of my other guns), I would like to find a way to reduce cost, then number of bullets/amount of powder I keep on hand, ect.
I have an older LEE mold that I use for my 9mm/.38 Super that casts a 111 grain RN bullet.....a little heavy for the .380 maybe, but for plinking and target practice, I'm thinking it will do just fine.
Problem is, I can't find any reloading data for the .380 with a bullet of this weight.....I've found some 115 grain bullet weight data...I'm assuming for jacketed bullets; could I substitute this and start with the lower loads and work up?