The safest thing is to use the load data for the next heavier bullet. If you look through the load tables you will notice that in general, the lighter the bullet the more powder is specified.
BUT, in this instance the difference between 115, 117 gr is so small that I would not worry about it either way. If you use the 124 gr lead data that would be even safer. Whichever data you use, start with the start load weight and work up from there.
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