I could not find this answer in my research so please forgive me if this has been answered before.
My Winchester SXP came with its own plug. I find with the BB load I use that I can only fit one in the mag! (1+1). It looks like it is maybe 5cm too short for the second shell. Therefore, if I shave it so that I can fit 2+1 would I still be legal? If I were to be stopped by a CO how would he test the capacity? I should think that I could easily show him that I could insert two only of the BB load that I would have on me.