next we'll be having discussions about pointy bullets in tube magazines... ^^^
Out of curiosity, have you ever slugged your bore? It's usually an issue with lead bullets (flinging them sideways) if they're undersized for the bore. But jacketed with a small bearing surface to begin with are going to have the same issue if they're a tad small, especially when they're driven that hard. If they're already wobbling before they hit the muzzle, there's no way they're going to be stable on the way to the target.