HKS speedloaders will do to do your intial load for each stage but do not penalize yourself by using them while reloading during the stages.
If you are shooting service class no external mods are allowed but if you are in what was known as open when I shot anything goes. I used a tricked out S&W model 65 with a Grand Power rib, 6 inch Shilen bull barrel, smooth trigger and double action only. In service class I used a 4 inch S&W model 19.
One thing I forgot to mention in my previous post is have lots of speedloaders [they are cheap] and paint the knobs so you can identify them when the blasting is over and you are policing your brass/