Berger .308 175 grain Tactical

Sample Size:

10

Ogive Radius:

6.08 calibers

Sectional Density:

0.264 lb/in2

Rt/R:

0.90

    This bullet was designed specifically to optimize performance of the M118LR class of ammunition.  The design objectives were to maximize BC while staying within the 2.800” COAL formagazine feeding, and the requirement for the bullet to remain stable thru transonic speeds.  All of these design objectives were achieved.

The average G1 BC of the Berger 175 grain Tactical bullet is 0.510 from 3000 to 1500 fps.  The G7 BC is 0.259, and is a more accurate representation of this bullets performance over a wide range of speeds (Click here to read about G1 vs G7 BC’s)  The BC of this bullet is 7% higher than the 175 grain Sierra MatchKing currently used in most M118LR ammunition, and 2% higher than the Hornady 178 grain option.

 The Berger 175 grain Tactical bullet requires a minimum twist rate of 1:13” to be stable from the muzzle.  Transonic stability was verified from a 20” barreled LaRue OBR with a 1:11.25” twist.

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

0.373

1.015

0.260

0.564

0.467

2000/1.79

0.323

1.030

0.256

0.518

0.509

2500/2.23

0.289

1.015

0.260

0.510

0.517

3000/2.68

0.263

1.014

0.260

0.497

0.530

Average:

1.018

0.259

0.522

0.506

Variation:

0.016

0.004

0.067

0.063

Rifling Twist Rate and Stability

Stability Factor

Barrel Twist

Best case

Nominal

Worst Case

1:10”

2.64

2.31

1.99

1:11”

2.18

1.91

1.65

1:12”

1.83

1.60

1.39

1:13”

1.56

1.36

1.18

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