115's I'd go with the slower powder HS6, I've run it with 9.0gr in my Shorty and it worked rather well, felt just as good as 125's. If you have a full size gun you can drop that load down a few tenths, my shorty runs about 50 fps slower than a 5", or .3gr. The issue I had with 115 was accuracy out of a 1/16 barrel, I have a 1/32 I need to try them in.
i think it's interesting how my shorty is 40fps faster than my 5"...