I used a 10-12 Gauge Mates in my 10b SB hammergun by that fine London gunmaker T BARCLAY & SON of Oxford Street.
I kid you not, I came across it at auction and just had to have it! No doubt just a hardware store.
Anyway, with fibre wads, which I use exclusively, it was a damp squib. You could tell by the sound and recoil that it was not doing much and they just tickled the birds. I suspect too much blow-by and loss of pressure.
Experimenting with plastic wads improved it immensely but as I do not hunt with anything but fibre, it was a non starter.
Just my experience, others seem to have had better experiences.
