Were it me, I'd use the 115gr lead data and feel perfectly safe.... eh, check that. I know what I'd do.... I'd plot a graph using listed load data and figure out where the data point for 117.5gr would be...
That would be entirely OCD and unnecessary though.
Using the 115gr lead data would be fine or just go half way between the 115gr lead and 124gr lead if you feel safer.
What powder are you using?