While I respect Jim in Idaho a great deal, and his advice is usually stellar, I disagree with the old jacketed bullet to clean out leading idea. I can't help thinking that cramming an essentially non-compressible slug down a fouled barrel can't be a good thing. At least some of the lead in the grooves will certainly be firmly ironed in place by the ogive of the jacketed bullet.
I stopped using OT Laser-Cast bullets long ago when I found them to be not only way, WAY too hard to obturate at sane pressures, but tended to be smaller than advertised. The two faults together make for horrible leading and negligible accuracy. They might be fine if you happen to have cylinders throats and bores several thousandths under minimum and like to launch cast bullets at warp speed. But in my guns (ALL my guns) they are -- I'll be delicate -- fecal.
