Hugnot
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After more than 1000 or so rounds the 1.5 and 3.0 throat might be the same.
My brain is a little foggy today, but this seems backwards.
A secant ogive protrudes further through a given datum, than a tangent ogive.
With this, you have to deepen seater plugs to keep VLD meplats from bottoming, because a secant nose goes further into a tangent seater plug datum.
Why would they lengthen a throat for a secant ogive?
Seems like land contact with reasonable seated bearing, for a VLD, would require a shorter throat (not longer).