So far my only problem with the plated Berry’s Bullets has been the speed limit: 1250fps for the 124gr. 9mm turned out to be a gross overestimate. It’s not the linear velocity they have problems with, it’s the rotational velocity. Barrel length and rifle groove make a huge difference. I don’t blame anybody - Berry’s, myself, the distributor or retailer - it’s a matter of testing and platform. My wife’s CZ 75C pushing Berry’s at close to 1100fps resulted in bullet disintegration at less than 25yds. They spun themselves to pieces. Xtreme “seem to be” much harder and the plating is much thicker - or, the bonding method is better. Not sure which but they hold together better than the Berry’s. They’re also more expensive.
As for the cannelure, I don’t worry about them. Just use a taper crimp and expand the necks as little as possible when seating. Good neck tension and stiction will do what needs to be done to keep the bullets from pulling. I load NCG bullets in .357Mag at hunting velocities and don’t have a problem. Use an FCD and swap the .38 insert for the 9mm insert if you’re really worried. Don’t worry about “swaging” the plated lead, either. The plating will prevent leading as long as its intact. If you open the plate with a roll crimp then all bets are off and you probably will get some leading, bad accuracy and rotational torsion damage in flight.
And, as always, my advice and experience is worth exactly what you paid for it. IMHO-YMMV-YBY