Don,
They'll shoot just fine at modest velocities. I cannelure them as well as any .50cal bullet that doesn't have a cannelure. If you remember, I made a cannelure tool that will do just about any bullet available in any caliber. Pictured below is the tool I made with a Speer Gold Dot 50cal bullet.
You've basically got two choices. Get a cannelure tool from Corbin or use a set of Lee FC dies. A regular set of roll crimp dies just doesn't provide enough crimp and the bullet will pull. Yes, they are cheap bullets, but combined with Trail Boss you get lots of fun.