All the years of my shooting, I carried the pouch on the left and the horn on the right. I was right handed and it just seemed more natural this way. My measure (brass with a slide funnel)was mounted on the strap below the knife. I pulled the measure with my left hand, pulled the horn plug with my teeth, poured powder with right hand then returned the plug still in my mouth. I returned the horn to behind my shoulder then tapped the measure with my index finger 3 times the slid the top across to pour. Worked like a charm for me!
Big John