Left as compared to the line of bore sighting, or left compared to some other load?  Just curious as Poyer often wrote about people complaining the rifles shot to the left.  I can't see that happening with a right hand twist.  Oh, I can see sights not aligned properly, back before they had windage adjustment, but if there's any curve to the trajectory from the bullet's revolution, it ought to be to the right.  Course, things are not always the way my head figures they ought to be.  Hey, that old Kleenbore 220 was humping, bet the powder dried out over the years.