Presslug slugs ?

Measure them.

Caliber diameter ÷ slug length if there were not a hollow point. Where the ogive angle.would intersect
Dia÷ the intersection angle of the ogive from the shank past the hp. If the slug were a Spitzer is ballistic profile.

So a 2s .217 is .434"
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From what I hear God have mercy on your soul if you ever need support with PS
 
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BTW the answer is 2.5S secant ogive for presslug
"Presslug brand swaging press. This tool forms lead into a secant ogive slug with a diameter of .2173 inches, also

BTW the answer is 2.5S secant ogive for presslug
"Presslug brand swaging press. This tool forms lead into a secant ogive slug with a diameter of .2173 inches, also known as 5.52mm. "
I don't have the slugs to measure so... Thank you!