Everyday stresses can wreck havoc on your concentration which is the key to consistantcy. I always start my sessions about 10 yards from the target since this is the easiest distance to concentrate on the bull. AFter a few shots the confidence is there so i' ll back off to 20 or 25 and shoot somemore. I quit shooting well before I start getting fatigued. I actually became alot more consistant with good shooting when I started shooting every other day instead of every day. And shoot just enough to keep that confidence built.