LOAD DATA FOR 257 DGR

All loads were fired across an Oehler 35p, with 4' spacing of the screens, 15 feet from the muzzle. Temperature was 88 degrees F. 

Bullet

Powder

Grains

Speed in Feet per Second

75gr Hornady V-MAX

N550 VV

44

3407

 

 

46

3507

 

 

46.5

3600

 

 

47.8

3671

 

 

48

3691

 

 

48.5

3722

 

H414

50

3689

 

760WW

50

3677

85gr Nosler BT

N160 VV

48

3410

87gr Starke

RL15

40

3139

 

 

41

3197

 

 

42

3266 still very mild

82.6gr Starke RPVB

H414

48

3449

 

760 WW

48

3454

 

 

49

3507

These were fired with the same powder.

Bullet

Powder

Grains

Speed in Feet per Second

85gr Nosler BT

760WW

48

3504

87gr Speer TNT

 

 

3412

87gr Starke BR

 

 

3407

 

THE NEXT 7 BULLETS WERE FIRED WITH THE SAME POWDER CHARGE TO SHOW THE DIFFERENCE BETWEEN BULLET SHAPES/BEARING SURFACE AND HOW IT AFFECTS LOAD DATA.

Bullet

Powder

Grains

Speed in Feet per Second

87gr Starke BR

760WW

48.7

3454

87gr Hornady SP

 

 

3482

85gr Nosler BT

 

 

3526

85gr Combined Tech BST

 

 

3489

85gr Berger BR

 

 

3479

85gr Fowler BR

 

 

3513

87gr Speer TNT

 

 

3479

 

LOADS WITH 100 gr. BULLETS

Bullet

Powder

Grains

Speed in Feet per Second

100gr Nosler BT

N160 VV

46.4

3232

 

 

47

3277 Max in this rifle

 

760WW

45

3219

 

H4350

44

3080 very mild

 

 

45.2

3183

 

H4831sc

47.5

3081 very mild

 

 

48

3122 still mild load

100gr Sierra HPBT

N160

46

3187

 

760WW

45

3114

 

 

45.7

3188

 

 

46.3

3235

 

 

 

 

 

 

 

 

 

LOADS WITH 115 TO 117GR BULLETS

Bullet

Powder

Grains

Speed in Feet per Second

115gr Combined Tech BST

H4831sc

46.6

2879 very mild

 

H4350

44

2987

117gr Hornady BTSP

 

44

2989

 

 

45

3050

117 Hornady BTSP

H4831sc

46.6

2906

 

 

47.4

2949 still very mild

 

N160VV

45

3036