257 ACKLEY IMPROVED

The following data was developed in a Ruger 77 rifle. It originally had a 243 barrel that was thoroughly shot out. We put a Shilen stainless steel # 4 barrel on it, finished at 24 1/5 inches.

We glass bedded the action in the original factory stock, and free floated the barrel. A Leupold 6.5 20 X scope was installed in Ruger mounts.

Remington 257 Roberts brass was used together with the Federal 210M primers. All bullets were molly coated, and all groups were 3 shots at 100 yards.

POWDER

VELOCITY

GROUP

BULLET

       

16.0 GREEN DOT

NC FIRE FORM

0.176

SPEER 100 HP

       

48.0 W 760

3064

0.668

NOSLER 85 BALLISTIC TIP

49.0

3116

0.801

 

50.0

3186

0.625

 

51.0

3246

0.903

 

52.0

3362

1.021

 

53.0

3394

0.537

 

54.0

3473

0.657

 

51.0 RELOADER 19

3008

0.426

 

52.0

3128

0.716

 

53.0

3228

0.298

 

54.0

3278

0.886

 

55.0

3394

1.160

 

56.0

3432

0.435

 

57.0

3509

0.239

 

58.0

3545

0.603

 

44.0 VVN 150

3085

0.456

HORNADY 75 V-MAX

45.0

3163

0.476

 

46.0

3233

0.627

 

47.0

3292

0.851

 

48.0

3400

1.045

 

49.0

3478

0.848

 

50.0

3548

0.331

 

51.0

3615

0.796

 

52.0

3676

0.453

 

50.0 VVN 165

2865

0.295

NOSLER 100 BALLISTIC TIP

51.0

2920

0.649

 

52.0

2962

0.818

 

53.0

3016

1.491

 

54.0

3115

1.139

 

55.0

3169

0.784

 

49.0 H 4831

2741

0.856

 

50.0

2800

0.603

 

51.0

2916

0.485

 

52.0

3010

0.624

 

53.0

3089

0.437

 

54.0

3117

0.448

 

55.0

3174

0.160

 

48.0 H 4831

2799

0.489

SPEER 120 SP

49.0

2884

0.744

 

50.0

2903

0.360

 

51.0

2949

1.478

 

52.0

3029

0.960

 

     
       

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Last updated 5 May 1999