Elvis,been loading the 7.62 x 39 for about 10 years now and have never run across a load using Lil Gun. It appears by looking at other load data it's similar to H-110 in that it has a very narrow Min. to Max. load range,want fill the X39 cast to a safe range to eliminate the possibility of a hangfire or worse without going overpressure for that cartridge. Contact Hodgdon they will be more than happy to supply you with some date if it's applicable.
My favorite all around powder for the X39 for J bullets in 123 to 180+ gr. range is Reloader #7 I generally stick with the 123 gr. in .310 and the 150 in .311 in my .312 bore SKS rifles. I believe the AA2207 is the equivalent of Reloader #7 the data on the ADI site pretty much matches the Min. and Max load ranges I work within with 123 to 150 gr. bullets.
I also shoot cast in the X39 rifles my two main loads using Alliant 2400 are with the Lee 165 gr. TL gas check bullet are 12.5 grs. @ 1450 fps. and 14.5 grs. @ 1900+ fps. These pretty much get shot strictly in the Chinese SKS because it cycles so well at very low velocity and drops the brass right at my feet. With 2400 start with 11.0 grs. and increase it by .5 grs. to a Max. of 15.0 grs till you get reliable cycling. In some instances I've found that even the Max. load of 2400 want cycle a semi-auto for that I switch to my old standby load of 18.0 grs. a starter load of Reloader #7 and they cycle smoothly.
If you cast the Lee .314 32 cal. 90 gr. TL SWC makes a nice little plinker small game sub-sonic load in the X39 case when you push it with a Min. of 2.7 grs. to Max. 3.0 grs. Bullseye,you can cast the bullet for pure lead if you like since the MV is under 1K fps. and accuracy is great out to 50 yds. the little bullet can be size down to .311 with no issues and used in any 30 cal. rifle from 30-30 to 30-06 with 3.0 to 3.5 grs. Bullseye with equal results.
Some but not all of my X39 loads.
165 gr. cast.
53 gr. HP sabots.