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What's the difference between the standard and #10 series backbores?

The Pickett #10 series opens up quicker after the throat entrance in comparison to the standard series. This increased taper volume provides a slightly more open feel with the #10 series rather than the standard series. Most players find the #10-3 to feel more free than the standard #3, and #10-2 more free-blowing than the standard #2 in comparison, and so on.
Ultimately it comes down to personal preference but these options allow the player to truly dial in the resistance and feel that they desire based on two internal shape.