You'll find both wads and filler used all the way to world level in both original and repro revolver competitions. The reasoning (and it's one I share) is that you want the ball to seat just below the chamber mouth to minimise the distance between ball and forcing cone. It seems logical since the speed the lead ball impacts the rifling will have an effect on whether or not lead is stripped from the ball. Imagine shooting a rifle when it's not firmly against the shoulder - it's the difference between a push and a punch.

Also, at international level, there is a rule that specifically states that cylinders must be sealed before firing. Having the ball close to the chamber mouth means the amount of grease/e45 needed is quite small - there's not much left after the first firing anyway. I agree with the previous poster that it's more likely that a chainfire will be caused by problems at the rear of the cylinder but rules are rules...

Cleaning the range is a good idea, unburnt powder will quickly aggregate to the point of being dangerous. It's not only that but lead is being vapourised from the back of the ball every time the gun is fired. Don't believe me? Have a look at the firing point end of an indoor range, even a 0.22 range will have a thin layer of grey dust on everything. This stuff will kill you just as surely as being hit by the bullet.

Still don't believe me? Look at http://www.bbc.co.uk/news/uk-england-london-17447380. This range (I shot on it before the handgun ban) was a first class facility and was maintained at the public expense. If combustible products can build up to a level where a spark will cause an explosion just imagine what could be happening in our own small community ranges.

From that on to the sales pitch - the MLAGB stock 44 wads in both 10 and 12mm length. Personally I use Sainsbury's semolina as a filler from a measure set up on my pistol stand and have had some relatively good results in the past. I always specify Sainsburys because it meters well from a flask or powder measure. Some of the other brands are a bit floury and can be inconsistent. If you want wads or accessories, drop me a pm and I'll see what I can do (I'm holding the stock). For what we can get hold of, have a look at http://www.stifters-gunflints.de/shop/main.php.