You might be venturing into a load combo that does not have much history. I might take the max load for the 155, reduce that by 5%, then work up until you find something that your gun likes, or pressure symptoms show up.
Please post your results in the Alliant sticky if you do get some results.
EDIT: I reviewed the Alliant data. The max of 8.9 gr under a 135 for 40 SW is also another reasonable starting load. That, by the way, is pretty close to the 5 percent reduction from the 10mm 155 gr jhp load. If it were me, it start at 8.9 and carefully work up to the gun's happy place -- with a targeted MAX of close to 10 grains. But I'm just a guy on the internet taking a bit of a SWAG at this, so please proceed with caution.
Last edited by Taterhead; 03-18-2015 at 01:18..