Unless Lil'Gun is one of those "do not reduce more than 10%" powders, you will be fine using the 158gr data.
If it were me, I'd plot the data for the other bullets in a spreadsheet and see where 140 should be. But that's just me. The true starting load is probably close to the 158 max load than the starting load but (naturally) you're (almost) always safer to start lower and work up.
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