.257 | 120gr | Speer Grand Slam bullet load data

.257 | 120gr | Speer Grand Slam

Speer logoby Speer · See details on brand website

Grand Slam
Contains lead
SKU: 1415
Twist: 1:11.0

The Speer Grand Slam is a premium hunting bullet designed for deep penetration on large, tough game. Its unique two-core construction features a front lead core for controlled expansion and a rear core that remains intact for maximum weight retention and penetration. The thick copper jacket and cross-member partition ensure the bullet holds together during impact with heavy bone and muscle. This design makes the Grand Slam particularly effective on elk, moose, and large African game where penetration is critical. Handloaders appreciate its consistent performance and ability to anchor large animals with proper shot placement.

Specifications

Weight

120 gr (7.78 g)

Diameter

0.257″ (6.53 mm)

Sectional Density

0.260

BC G1

0.328

Type

Grand Slam

Min. Twist

1:11.0

Related Load Recipes

Load recipes using .257 | 120gr | Grand Slam are available in the following cartridges:

Similar Bullets

Same-caliber projectiles within ±0.003", ±5gr and matching lead content from other brands.

Community Load Data for .257 | 120gr | Grand Slam

Loads for .257 | 120gr | Grand Slam from our community:

4 loads

cartridgePowderBarrel (in)Charge (gr)OAL (in)Max. Pressure (psi)Muzzle Velocity (fps)
.25-06 Rem.Hodgdon H435023.048.03.09554868 (84%)2848
.25-06 Rem.Vihtavuori N16023.048.23.08857435 (88%)2884
.25-06 Rem.Vihtavuori N16023.047.83.08856014 (86%)2864
.25-06 Rem.Vihtavuori N16023.0••.•3.08860742 (93%)2927