After shooting cast projectiles for the last 30 years or so, I have come to the conclusion that there are certain calibers that do not operate well with cast lead bullets. All of the high pressure "magnum" rifles of smaller calibers seem to fit into this category, like .223 Remington, .243, 7mm Mag, 6.5 Swedish Mauser and 300 Win Mag. Although I "play" with much reduced velocities of cast bullets in these calibers just to see what I can do. My question is, there has been much discussion here about cast lead bullets in the 9mm Luger pistol and all the "problems" it presents. Is this another one of those that should only be used with jacketed bullets for best performance? Particularly if used for a self defense carry pistol?