I'm working on a good defensive load for my BondArms Stinger .38 Special Derringer. It is apparent that I will most likely not be able to push a Hornady XTP (110gr over 5.6gr 231) or the Hornady Critical Defense (110gr) fast enough for reliable expansion in the intended target. Although I did enjoy the fireball from the 231, avg. FPS was only 726 fps. The factory Critical Defense chrono'd at an avg 716 fps. I have a box of 100 gr Lehigh Defense Xtreme Defense bullets. I am looking for load info as the only thing online is from Lehigh and it is listed as +P load data. I loaded on the lower end using 7.9gr of Accurate #5 with a 1.53" COAL and it chrono'd at an avg of 802fps. No signs of over-pressure with the test rounds. Looking at all the load data resources, there is no 100gr recipes. Being relatively new to this (and not wanting to blow up my gun or hand) when looking at the reference books should I start with data on the 90 gr or the 110 gr? Is the powder charge to bullet weight an inverse relationship?