Berger .308 155.5 grain FULLBORE

Dimensions taken from Lot #123

Sample Size:

10

Ogive Radius:

9.6 calibers

Sectional Density:

0.234 lb/in2

Rt/R:

0.96

    This bullet was designed specifically for use in US and International Palma and FULLBORE competition, optimized for the under 156 grain weight limit in place for those events.  It quickly became accepted as an inherently accurate and length tolerant bullet with performance equal to the best available in its class which currently includes the Lapua 155 Scenar, Sierra 155 MatchKing, and the Australian made Dyer HBC.

   You can read a fully detailed comparison of these commonly available bullets in this article.

  Several attributes of this bullet make it ideally suited for use in Palma and FULLBORE shooting.  First, the long tangent ogive reduces drag and makes the bullet length tolerant (accuracy is not sensitive to jump distance).  Furthermore, the short bearing surface allows you to seat this bullet in the case with very little of the bullet below the case neck/shoulder junction.  This maximizes internal case capacity available for powder.  Combined with the lower friction of the shorter bearing surface makes 3000 fps+ velocity very easy to achieve from a standard 30" Palma barrel with moderate pressure.

  The list of National and International Championships and records this bullet has set is long and distinguished.  Foremost on this list has to be the Great Britain Rifle Team winning the World Long Range Rifle Championships with this bullet in Brisbane, Australia.  For a bullet in this class, there is no greater accomplishment.

   This bullet is available loaded in the .308 Winchester cartridge from Applied Ballistics Munitions.

Drag and Ballistic Coefficient

Fps/Mach

Cd

i7

G7 BC

i1

G1 BC

1500/1.34

0.375

1.021

0.229

0.567

0.413

2000/1.79

0.315

1.007

0.233

0.507

0.462

2500/2.23

0.276

0.971

0.241

0.488

0.480

3000/2.68

0.248

0.953

0.246

0.467

0.501

Average:

0.988

0.237

0.507

0.464

Variation:

0.068

0.016

0.100

0.089

Rifling Twist Rate and Stability

Stability Factor

Barrel Twist

Best case

Nominal

Worst Case

1:10”

2.45

2.14

1.85

1:11”

2.02

1.77

1.53

1:12”

1.70

1.48

1.28

1:13”

1.45

1.26

1.09

*Stability Factor above 1.4 indicates good stability.  Below 1.4 indicates marginal stability.  Less than 1.0 is unstable.