As per pm: the choke definitely matters in .177.
I have 2 Spitfires, with .177, .22 and .25 barrels.
A gunsmith once shortened my .177 original Spitfire barrel, at my request, and I have regretted this ever since. Without the choke the .177 JSB's, which grouped very well before, were all over the place.
According to the gun's designer JB, the choke is less important in .22 and .25. Having recently acquired the .22 and .25 barrels, both generic ones, I haven't tested them yet. I did manage to find a .177 unshortened Spitfire barrel in the end btw, but that took some years.
Cheers, Louis