I use a wooden dowel, just slightly smaller in diameter than the hole in the center of the moon clips. You just stack the clips on the dowel. You can make the dowel as long or short as you need... Mine fits perfectly in my range bag because I made them just the right length. One end has a wooden disk the same diameter as the moon clip itself, held in place with a wood screw. I always point the bullet end of the loaded cartridges at the wooden disk. The other end has a hole in it that takes a 1/4 inch metal pin, the pin being held in place by a spring clip - this is the type of pin people use to hold the latch in place on their trailer hitch (when they are using the "lock type" pins)... You can find them just about anywhere trailer accessories are sold.
On the range itself, I use HKS speedloader pouches, size large. Each pouch will hold 2 fully loaded .45ACP moonclips. So, 2 pouches equals 4 reloads.
Hope this helps.