Over the past 2 years I've gained the impression that Speer's GDHP bullet in duty/defense-ready factory ammunition is rapidly emerging as THE hollowpoint bullet line for both police duty ammunition and personal defense. I have nothing against Hornady's excellent XTP bullets, and in fact load more of theirs than I do of Speer's for hunting... but the fact remains, the GDHP is arguably the best 'premium' modern JHP pistol bullet in the self-defense/duty marketplace.
Nonetheless, Speer's Blazer 200 gr .44 Spl load is, by my tests, anemic at best, with only 600 fps out of a 4" M29 barrel. This is not sufficient for defense/duty use. Even the GDHP is insufficient at that velocity. I could accept its value at 900 fps, but to the best of my knowledge there isn't a 900 fps factory load of this bullet out there. If Speer sees fit to make one, I envision alllllll kinds of folks buying S&W Model 21's and making 'em their Numero Uno carry sixgun.
Stay tuned.