the sthp is about as long as will fit in the seecamp mag. fmj is too big in o.a.l.
the non toxic 5 minute epoxy does not add to the length. it just fills the cavity giving it a flat nose profile.
if i had a seecamp or could afford one, i'd think about doing this too, elmers glue would work too i guess, just to stop the drivel about "killer" bullets.
going back to the .380 question, id use fmj over a h.p. for the assurance of adequate penetration, something an expanding .380 h.p. does not deliver.