Weight of the projectile is not an issue. Issue lays in the shape of the bullet. To fit in to mags and feed reliably the 115 gr bullet has to be round nosed and with straight walls. It has to be seated deep enough as well.
If you plan to use 115 9mm Para bullet then you will run in the issues like, over crimping due to conical construction and not enough of support at the case mouth. Then it leads to COL being too long and your cartridge won't fit in your mag.
None of 9x19 bullets will work in 380 due to their construction. Best ones to use is Barry's 100 gr copper plated 380 bullets that are specifically made for 380 acp.