I use the exact same ammo for everything. Avoids confusion.
I'm right handed and use a Tupelo Bandolier. After last round is fired I leave the lever closed with the rifle still held tightly to my shoulder with my left hand and pointed at the next target. With my left hand I rotate (Rotate around the axis of the bore) the rifle slightly to the left so the loading gate is now in my line of sight. At the same time I grab a live round with my right hand and bring it up and push it into the loading gate with my right thumb. Since the rifle is still on my shoulder and still on target all I have to do now is rotate it back to the right, cycle the lever and bang.
The main trick during all this is to hold the rifle tight against your shoulder. If it slips all bets are off.