Not sure on the penetration, but 8 rounds of .38 up blose would be a heavy dose with both barrels. Neat little rig there. Let us know how well it will penetrate please.
36 cal. and not the weight of 38 cal. slugs . Yes I know 38 is .357 not 38 . But and a big but is the weight . Also a round ball vs. a pointed bullet .
And yep I had one and would not carry for self defense , why first its a bear to cock and shoot in a hurry . Its a gut wrench not a gun for even a short distance . Don't believe me try this - draw and fire at a 3X5 index card at 7 yards , do it in 1.5 seconds and you should be fine . IMHO .