Originally Posted by CampingJosh
Will lead even hold together at 4300 fps? I don't really know anthing about wildcats, or reloading at all for that matter, but I do know that 4300 fps is fast!
That is a maximum load in the MachIV, with a light 21 Gr custom bullet, swaged by Todd Kindler.
Lead and copper will certainly hold together, at that velocity, assuming a quality bullet; an unbalanced one will come apart, quickly at such speed, and rotational velocity.