Coop, email Alliant for a suggestion. I would bet you would be fine to use the 32 H&R Mag data for the hollow base wad cutter and BI. Might need to increase very slightly to compensate for your larger case. I don't shoot the 327 but I've done similar with the 357.
Red or Green dot, Unique, might be a little better for your case but BI meters well.
I think the powder companies figure if you have this cartridge you are looking for top performance hence only list hot loads.
Or check the Hodgdon site for the 90 gr HB WC loads using Clays, HP-38, etc for mild loads.
I don't have the latest Lyman or Speer books - they may have good light loads. I think you'll find a good accurate load with a very small powder charge which is a big cost savings.
I have had good responses from powder companies when I've sought their advice on loads - call or email them.
What I've seen of Lil gun, it is NOT a light load powder. And like others have listed here, it may have a much higher flame temp that may accelerate erosion. I am wary of it tho I've tried in my 41 mags.