I was running around trying to do a soul siphon build and I wasn't noticing much of a difference between running one two punch on the Ironwood handcannon and normal play. Went into the firing range against a boss target and tested out shooting once with ironwood, using pocket singularity, and using soul siphon in different orders. Shooting first to proc one-two punch on pocket singularity gave the best damage by far at 1457, shooting second to proc one-two punch for soul siphon only dealt 1269, and shooting after doing both melees only did 1241 damage. Would be nice for one two punch to improve its damage