FYI SSG is .27 so pretty close to between a #1 and #4 buck probably a #2 so if you can get a #1 16 pellet buck load then it will probably do as good, but I'd rather 20-24 pellets of # 3 buck.[/QUOTE]
Yes the British SSG buck is the same size as American 2 Buck [0.270"] and I reload this in 12, 18, 21 & 24 pellet loads in 12 guage. Out of my Moss 500 with 24" barrel and ex full choke [0.690"] these loads will pattern at about 75% in a 24" circle, tight enough for me, much tighter you have to aim like a rifle rather than point. I find the 21 pellet load with buffer in a 3" case holds a good pattern beyond 40 yards on a 30" circle.
I also load 1 Buck and 0 Buck [0.320"] and 14 x 0 Buck with buffer in a 3" case is excellent putting 10 or 11 hits in a 30" circle at 50 yards.