I like Blackhawks, I have two, shoot them alot, broke both.
The first was about a year or so ago, .45 Colt 7.5", the aluminum grip frame broke. Turns out not too uncommon, still hacked me off, but a gentleman on this board supplied me with a brass frame that I fit and it looks great, shoots well, and will last better than the aluminum frame.
Memorial Day I lost the front sight blade off my new (Christmas 2007) SSNMBH 4 5/8" .357. The load was 7.0 gr Longshot under the Group Buy 175 gr Keith SWC, 1112 fps. Not a hot load. I found the blade which dismounted in recoil, the metal under the retaining pin had broken off and turned the blade loose.
Now I do recall when I first fired the gun in January, the shots fell drastically left and the front blade was leaning considerably to the right. I pushed the blade straight and the shots fell where they should. I believe that was the root of the problem - metal fatigue. I'll guess the front sight blade recieved a blow that bent the blade, then I bent it back, starting the fracture, that increased with each recoil, until it failed.
I've just checked Midway and will order a replacement tomorrow - about $5. I'll also get one for my .45 Colt BH, and a few retaining pins, round out the order with some 8mm gas checks. Then the my world will be happy again.
I don't think I'll fault Ruger for this one, it probably happened after the BH left their hands. Still I've never had 2 cast parts literally break off the respective revolvers, and have had these two failures with BH's in about a years' time. Odd.