I for one have done this same thing and I have found that the Lehighs were spot on as well. I reload for my CF's and never buy factory ammo, quite a few years back I checked several factory loads that were very inconsistent in the powder charge as well as the bullet weight. I do feel that a grain or two makes a difference with any loads, may it be smokeless or not. Bullet weight difference by a grain or two will not effect the shot no where as much as the powder charge will.