The reason it's better is because the imperfections on the barrel wall have less effect on the BB when they're further away. The air cushion reduces inaccuracy due to fouling or shitty barrel lol
There's no reason to get a 6.23 over a 6.13 though. The 6.23 is just ridiculous.
Like I keep saying, once the BB is stabilized, it's stabilized, and no amount of longer barrel, tighter OR wider bore, or extra smooth barrel quality will ever make it any more stabilized.
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