If you recover and examine some fired bullets, you will see no slippage with jacketed bullets. They will have clean rifling lands and grooves engraved in them with no slippage evident.
Some slight amount might be found on soft lead bullets, but there can't be much at all or bore leading would be so bad you couldn't use the gun for more then a few shots.
If the bullet slipped even the width of the groove, the land engraved on the bullet would shear off completely.
And that isn't the case at all.
In short, the bullet or jacket hardness has to be matched to the expected velocity to prevent slip. And this is always done by the bullet manufactures.
Keep in mind the bullet doesn't reach max velocity in it's own length, even in a snub-nose..
And it takes very little force to rotate a bullet on it's axis compaired to accelerating it up to speed from a dead stop.
rc