The fact that neither Co2 removers and grease extraction methods are not on the dedicated Australian muzzle loading suppliers would indicate they are not in widespread use.
I have shot a lot of matches in a lot of places and am yet to see one. Maybe they are there in the southern states but none here in the north.

What I sought to do was make a simple tool that avoids the problems of other methods.

Mention was made of stripping the ball and that has been overcome by better hardware and technique

I have one being tested by some friends and currently waiting for feedback. When i have positive results from a range of different people I will post them.

Thanks for your replies