Load data for 8.6 mm Blackout + 250gr Speer Grand Slam
429 suitable loads across 81 powder(s) for cartridge 8.6 mm Blackout with 250gr Speer Grand Slam bullet.
The most recommended powders for this combination are Alliant Power Pro 1200-R, Hodgdon H322 and SNPE Vectan SP 10.
Based on SAAMI, the max. allowed case length is 1.685 in / 42.80 mm, the max. cartridge length is 2.825 in / 71.75 mm, and the max. allowed pressure is 61,999 PSI / 4,275 bar.
Based on SAAMI, the max. allowed case length is 1.685 in / 42.80 mm, the max. cartridge length is 2.825 in / 71.75 mm, and the max. allowed pressure is 61,999 PSI / 4,275 bar.
Load Specifications
ImperialMetric
Bullet:.338 | 250gr | Grand Slam
Cartridge:8.6 mm Blackout load data
Case Length (L3):1.685" | 42.8 mm
Cartridge Length (COL/L6):•••
Seated Depth:0.338" | 8.6 mm
Case Capacity:50 gow | 3.24 cm³
Primer Size:Large Rifle (LR)
Max. Pressure (SAAMI):61,999 psi | 4,275 bar
Barrel Length:16.0" | 406 mm
Min. Twist Rate:1:6.0
Get PRO license to unlock all data and calculators