Doesn't seem a problem. The "filler wads" just blow out of the barrel and can be found lying a distance in front of the muzzles from time to time.

Will have a look at the book and see why?

BTW does ANY Aussie actually use Kynoch foam wads as a filler in Australia? Is it even sold here?

I'm just interested as the furniture foam filler is commonly used to my knowledge.

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(NOTE AS ALWAYS, USER BEWARE, USE ANY RELOADING INFORMATION STRICTLY AT THE USERS OWN RISK, AND ALSO CONSULT ALTERNATIVE INFORMATION AND DATA SOURCES ON ANY LOADING INFORMATION AND LOADS. BE AWARE AND LOOK FOR ANY WARNING SIGNS WHEN SHOOTING CUSTOM HANDLOADS.)