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A chamfered opening IS a forcing cone!
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In the sense that a chamfered opening shovels the projectile into the bore, then yes, any chamfered opening is a forcing cone.
However, if one considers a forcing cone as a device that performs the function of shaping and sizing the projectile correctly for the bore's geometry, then not all chamfered openings are true forcing cones.
And then you have to consider the term 'throat' and how that relates, or not, to 'chamfered opening' and 'forcing cone'.
At this point, my head hurts and I'm going to bed.
