For every action, there is an equal reaction.
115gr may not have enough energy to cycle the slide completely. Try 124gr.
If that works, then stay with the 124gr for awhile.
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
Life Member NRA
Life Member NAHC
Former President of the ECPT (Eifel Combat Pistol Team)