Well TEST IT. If you can. I don't see how. In a CLEAN DRY barrel its going to fall to the breech. I a barrel with dry fouling, its most likely to fall to the breech. If the fouling is DAMP as it often will be if blowing through the bore to soften to allow loading some will stick to the fouling. So what will be encountered is wiping. Either to remove to fouling or to get the powder all down. Personally I think this is the silliest thing I have seen yet. A few grains weight, or even granules of powder is not going to effect accuracy in the slightest. Uniform compression of the powder is more important. If you doubt it try shooting a 10 shot string from a rest varying the pressure on the powder from shot to shot. It has been know for a VERY long time that this is more important than having the EXACT same powder weight.