My understanding is that data for a heavier bullet will be safe for a bullet that is the same but lighter. VV lists data for 3N37 in the .40 with 170gr bullets on their site,
http://www.vihtavuori.fi/vihtavuori/pistol/40sxw.htm
5.8gr 1037fps
6.8gr 1148 fps
If it was me, this is where I would start.