Here's a quick tip for those of you that like to recycle old 50-round ammo boxes (works great for flying to matches since you don't have to haul the boxes back home, or there are some countries where reloading is technically illegal although everybody has a Dillon in the closet and so on)--
CCI plastic factory ammo trays with square holes (Blazer, Blazer Brass, Lawman, etc) are almost a perfect fit to the Shockbottle case gauges, especially the .40 and .45.
Hold one over half of the gauge and something flat over the other and flip carefully.
If not all your trays are the CCI kind (especially the larger plastic and styrofoam trays), take a CCI tray full of nose-up ammo and place the larger tray onto it about in the middle, flip it, shake a bit and most of the time the ammo drops right into the holes of the larger tray. That also works with half-full 100-round boxes and plastic 50-round boxes but can be a bit more awkward to manipulate.