Possible silly question about big bullets going down narrow tubes

[RJW NZ]

I have a nice old long tom with a very very tight muzzle, it reportedly shoots very well. It prompts me to ask, is it a given that the tighter the fit of barrel to bullet that the accuracy improves? Or is this back in the arena of greater mysteries of the enfield universe that sometimes looser fitting bullets sometimes still shoot really well.
Its been bothering my somewhat rational mind that undeserved accuracy should still be able to be explained logically ...any comments?

and a ps, is a CLLE enfield a rare bird or simply uncommon, or other? There's a sporterized one floating around here, see pics, and wondering if it justifies rescuing?

and by the way, happy new year everybody ...

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