SMK's are almost always Tangent ogives. That's why they are jump tolerant (and a little lower in the BC department). The Berger hybrids are tangent ogives switching quickly into a secant tip. Thus the term hybrid (and a boost in BC numbers). Just sayin'
That is correct for most of Sierra's bullet but not all. As per Sierra's web page, the 7mm 180BTHP MK has a 12 cal secant ogive. And Duane Siercks confirmed me the 175 has also a secant ogive.
That's why I'm looking for shooters who tried these bullets.