Wax bullets propelled by a 209 primer(no powder) goes out with a speed of 6-700 fps. That's fast enough in my book. CFDA shoots wax at 21 feet. OFDA shoot as far as 25 feet. It can go even farther. If you want higher speed you can load 1 grain of whatever powder so you'll have a bit of smoke and a tad recoil. Possibilities are endless but the purpose of using wax is learning a draw, a moving sequence, cocking fast multiple times and hitting multiple targets etc from relative close range. After the body and mind know the move, live ammo is required to complete what was learned.
The wax bullet goes inside the shell using the thumb. The primer pocket has to be enlarged to accept "flush" a 209 primer. Primer will be sat on the shell using the fingers. Once shot, the spent primer is thrown, add a new bullet a new primer and here you go again. Shells will last a lifetime as there is no pressure big enough to deform the shell walls.
I have 400 shells like that (I bought them ready made) and I shot them probably 1000 times each and they are like I bought them yesterday.
Tip: before shooting the first wax bullet run an oily patch through the barrel. Wax will build up after 20-30 shots so oil will slow down the build up wax. Every 20-30 shots run the oily patch again once or twice. I shot once without cleaning the barrel at all to see what will happen. After 100 rounds the barrel was so clogged with wax, the bullet got stuck in the barrel. Then I shot another bullet behind the stucked one. Then another one until the whole barrel was full of bullets. So that is the worst case scenario when shooting wax and forget to clean the barrel.
To remove a such mess, boil a cup of water and dip the barrel in the cup and they will all melt away and you'll have the barrel perfectly clean.
Don't want to do that, then run a patch dipped in any oil through the barrel every 20-30 shots and you'll have no issues at all.
WARNIN

even with no powder behind, a wax bullet can still do some damage to yourself or others. So safety at all times just like with live ammo. Wax hurts like hell. The wound do not require a visit to the hospital but is still very painful.
To make a better idea watch this video:
https://www.youtube.com/watch?v=YClXt2gdWrI