If the bullet is "lightly engaged" in the rifling, then there would be virtually no load in chambering it.... You would only feel a hint of resistance just as you close the bolt, correct?.... If my math is correct, a 1 degree leade angle over a .004" rifling depth (eg. 300 land, .308 groove) means that the leade would be about 1/4" long.... 1/2 degree would mean the leade would be about 1/2" long....
Bob