I bought these to clean out my steyr lg110 and they did the job.
I put a drip of hopes no9 on the felt load into breach followed by a flat head match pellet, the pellet causes the felt to expand cleaning the barrel, repeat with dry felt and your good to go
I captured the felt and you could clearly see the grime on it.
Exercise safe shooting practice when using, they may be felt but are moving fast and will cause a wound if hit by one.
All in all a good product, they make them for cleaning most firearm calibres too