IME, most Brit guns have barrels and chokes regulated for fiber wad loads. I have loaded fiber (and plastic) for some years and do not notice much difference in their ability to kill birds.

I have loaded a lot of fodder with fiber wads and 'Kwik cert" shot wrappers and like them as well. I am currently loading some fiber wad 2-1/2" roll crimped 12 ga. loads for my Atkin and looking forward to seeing how they perform.

C Man
Life is short
Quit your job.
Turn off the TV.
Go outside and play.