What distances are you shooting? I have shot "buggered up" lead tipped jacketed bullets all my life. Nosler, Speer, Hornady, Federal, and Winchester. If your rifle has a magazine, like my Win. Model 70, every subsequent lead tipped round is flat nosed, and some are pinched and crimped depending on the number of times they have been loaded into the magazine. Certainly rounds two through five are not "Factory Fresh" after touching off the first one as the momentum of the rifle slams the "unsuspecting" bullets into the leading edge of the magazine - flattening each and every one of them. Still, I am single shot killing both deer and hogs out to 220 yards with less-than-pristine nosed rounds. I am getting very good to excellent groups on paper targets too. I believe that true trajectory is more about bullet-powder-barrel harmonics-and-stability of flight than the aerodynamics of the bullet's nose. Lead tipped bullets are either sheared off or smoothed by the massive air friction at or near the muzzle, or the stabilizing rotation of the round (210,000 rpm's +/- for my 270 Winchester velocity) centrifically rounds the soft lead into a ballistic projectile when propelled over three times the speed of sound. Slamming that lead tip going forward into the air and asking it to rotate at the same time has got to be some kind of violent ride for the molecules that are jumbled up there.