The S.L. Variant speed loader I ordered arrived today and I am very happy with it. Unlike most speed loaders where you twist a knob on the rear of the loader to release the cartridges and they slide into the chambers under gravity, with the S.L. Variant the cartridges are all sitting on top of springs and a latch holds them in place. When you insert the cartridges/speed loader into the cylinder there is a release plunger located at the center of the loader inside the ring of cartridges. A firm press of this plunger against the rear of the cylinder releases all the cartridges and the springs they are all sitting on "squirts" them into their respective chambers with authority, even when the revolver is held horizontally.