I have just finished gelatin testing one each of Federals 'Personal Defense' loads in bare ballistic gelatin : 110gr .38 special, 129gr .38 special, 130gr .357 magnum, and 90gr .380ACP . I had the extra gelatin powder laying around and the ammo, so...
110gr .38 special expanded and penetrated to ~ 13.5" . Out of a 2" snub
129gr expanded and penetrated to 14" . Out of a 2" snub
130gr .357 penetrated to ~ 13.5" with severe fragmentation - suprisingly though, most of the lead ended up at around 13" penetration. Very nice round. 4" revolver.
The 90gr .380ACP was fired from a 2.75" barreled automatic and wound up at 11.75" penetration.
Given the 'name games' that the anti-gun pinkos play to get their ideology passed into law, i.e. 'assault weapon' , 'pocket rocket' , 'high powered sniper rifle' , and the fact that these tactics are targeted at the masses of people, who are now generally scared of their own shadows and unbreakably dependant upon the government for survival - I would attempt to find a bullet that has a 'nice' sounding name and an effective performance in controlled test events. (gelatin).
I would look into what bullet acronyms stand for before considering them as a contender - I think in the case of Hornday XTP, the XTP stands for 'eXtreme Terminal Performance' ... It might deprive the opposing legal element an avenue of approach. Good luck. Tom