You have me curious about this hobby. It seems like reasonably affordable fun. Can a guy shoot .38/.357 in this game? Obviously from an SA revolver. Spending 4-5 bills on a gun to play with is not too bad but That way I would not add a new caliber which is unpalatable to me.Good question, Ryan, and no, you can't play the Cowboy Fast Draw Association game with out a single action revolver in .45 Long Colt. But, we'll explore that question later and the reasons for it. The simple fact of the matter is that I was playing with wax bullets for a long time before I ever heard of the CFDA. Using wax bullets is a great way to train in your backyard, in virtually any city in the US. Common gun-handling skills are accentuated, and with just a modicum of equipment you can be shooting wax bullets in any caliber before the end of the day.
There is a great American Rifleman article on shooting wax bullets at this link.
I've shot wax through .38/357, .44 Special/.45 ACP, and could probably, in just a few minutes, build some for the 9mm. For revolver cartridges, you have to drill out the primer pocket. I normally use a small bit to ream out the flash hole so that the primer doesn't flow back and tie up the gun. Mark those brass and use them only for wax. If you ever reload them with a standard charge, you may create unsafe pressures that will damage you or your gun.
For autos, it's simpler. There is not enough recoil impulse in the wax bullet load to cycle the mechanism, so the gun becomes, for all intents and purposes, a single shot. However, that's great as the act of drawing and hitting are often a single shot event.
I assume you own a cell phone, as many of us do in this day and age, so you don't even need to buy a timer. There's anapp for that. I use the IPSC Shot Timer, which is free and does a good job recording times from the draw signal to the sound of the shot.
SO, let's say that you want to train in the backyard. Load some wax in your 9mm brass, download the app, hang a bed sheet in the back yard. Put a target in front of it. Load one wax bullet cartridge in your Glock. When the timer beeps, draw and fire one round. Now, you have a time. Cycle the pistol manually, get set for the second shot, lather, rinse, repeat. If some of your buddies are around, show them how cool it is to shoot in the backyard.
Can you draw from cover and hit a target with one round, in less than a second? It's a lot harder than it sounds, and wax bullets are one way to train in almost any locale. I recommend wax bullet shooting, it's a great way to teach new shooters about our sport. It's relatively safe, low recoil, low noise, and wonderful fun.