Yes, virtually all ammunition of any caliber or gauge you choose to name has been improved by modern technology. That is pretty much a given to begin with. And there has always been some variances in the actual sizes of shot, including buckshot, between manufacturers and within gauge...i.e., Federal 00 Buck would rarely be the exact same size as Remington 00 Buck. It's the nature of the beast. In fact, actual shot sizes within a given shotshell will typically vary a few 10/1000's...probably less now with modern production techniques than in the past....but they do vary. That's really not news either. The point is, these variances are generally minimal and within an acceptable range.
Last edited by TxGun; November 23, 2012 at 02:30 PM.