Load data for 7 mm Backcountry + 135gr Atomic 29 HP
661 suitable loads across 111 powder(s) for cartridge 7 mm Backcountry with 135gr Atomic 29 HP bullet.
The most recommended powders for this combination are ReloadSwiss RS 60, Alliant Power Pro 2000-MR and ReloadSwiss RS 52.
Based on SAAMI, the max. allowed case length is 2.417 in / 61.39 mm, the max. cartridge length is 3.340 in / 84.84 mm, and the max. allowed pressure is 79,916 PSI / 5,510 bar.
Based on SAAMI, the max. allowed case length is 2.417 in / 61.39 mm, the max. cartridge length is 3.340 in / 84.84 mm, and the max. allowed pressure is 79,916 PSI / 5,510 bar.
Load Specifications
ImperialMetric
Bullet:.284 | 135gr | HP
Cartridge:7 mm Backcountry load data
Case Length (L3):2.417" | 61.4 mm
Cartridge Length (COL/L6):•••
Seated Depth:0.347" | 8.8 mm
Case Capacity:73 gow | 4.73 cm³
Primer Size:Large Rifle (LR)
Max. Pressure (SAAMI):79,916 psi | 5,510 bar
Barrel Length:20.0" | 508 mm
Min. Twist Rate:1:11.0
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