Camba: The limitations of the M19 are few but one thing that caused problems with them in the past was the use of high speed, lightweight bullets. I had always thought it was the fast burning powders that caused spacers at the end of tyhe cylinder to disintegrate but not so. Apparently, and after a bunch of discussion, it was the higher speed jacketed slugs that caused forcing cone fractures.
The M19 is a great handgun. It will handle any cast slug you want to throw down the tube. My favorite is the 200 gn cast semi-wadcutter and I prefer the use heavy factory powder charges of Winchester powder. I am not a fan of heavy jacketed bullets in short barrelled magnums and 1250'/sec isn't really all that great when you can throw a 200 gn cast swc out a 1330'/sec.
The M19 seems to be able to handle heavy loads better, at least mine did. I never had a problem shooting the heavy slugs. Mikey.