Yes, the "bore" is really referring to the way that it "flares" out in the cone. This is what the Rascher people talk about when they refer to the parabolic bore. It isn't a different volume, just different proportions in different sections.hornimus said:I could be wrong here, but if you start measuring the IDs and lengths of body tubing, compare bow dimensions, etc. I venture the CJS and the Signet are going to be too close physically to infer any expected differences in mpc compatibility. Could it be their necks?
This "bore" discussion should keep in mind that for horns to be tenors, they have to share the same volumetric displacement inside. Having a "big" bore at one cross-section dictates having smaller dimensions elsewhere.