GoVandals and Spotshot, I don't know what to say. I looked at the Speer link, and it does indeed say .52.
I think I would give Speer a call if it really makes all that much difference. I am one of those that just always loaded the projectiles, and if it shot to my accepted level of accuracy, I stretched it as far as I felt comfortable and stopped. I decided long ago that most rifles were far more accurate than I was...