Back in the stone-age I discovered that round nose bullets could have feeding issues in some rifles. I had similar issues with Remington's factory 180 gr scalloped round nose Kore-Lokt loads. As often as not, coming off the right side of the feed ramp, when loading with the cartridge high right in the magazine, the exposed lead would bite into the port (left) side edge of the entrance of the chamber. When the cartridge was in the left high position of the magazine, it tended to feed straight in. The original 215 gr bullet had a longer ogive then its lighter counterparts, as did CIL's 215 gr KKSP, which probably accounts for the difference in feeding. I don't know if there's much to be done if you already seat the bullet to the cannelure; there isn't enough shank below that to seat the bullet out. My solution at the time was to switch to a pointed bullet, and after that to a .30/06.