Need Some Measurments Base To Ogive

[highlife]

Looking for Base to Ogive Measurement's on
6 mm 107 gr SMK
6 mm 105 gr Amax

Richard

 

[Scott Harris]

I don't have the exact bullets you want, but I had them in the past and the Sierra Base to ogive was similar to the Berger 105 and the Amax was similar to the Hornady HPBT shown below. Long and the short is the Hornady bullets have a MUCH longer bearing surface than either the Sierras or Bergers. The numbers below reflect that difference.

I start a new barrel with the Bergers and then move to the Hornadys after about 2000 rounds when the throat has advanced. Even with the throat being pushed forward about .03 from wear, I still have to use a throat reamer and move it forward another .050 to get the hornadys to seat with the boat tail above the case neck-shoulder junction.

Hornady 105 HPBT = .623
Berger = .546

Difference =.077

 

[highlife]

107-SMK <> .180-BT + .390-BR = 0.570" (1.225" OAL)
105 AMax <> .150-BT + .460-BR = 0.620" (1.230" OAL)

That's what I needed
Thank you
Richard