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Load data for .257 Ackley Improved + 75gr Sierra HP Varminter

293 suitable loads across 58 powder(s) for cartridge .257 Ackley Improved with 75gr Sierra HP Varminter bullet.

The most recommended powders for this combination are Somchem S365, Rottweil R 903 and Vihtavuori N150.

.257 Ackley Improved cartridge with combo bulletSeated DepthL3 = 2.333 in / 59.26 mmL6 = 2.775 in / 70.48 mmSeated Depth = .309 in / 7.85 mm

Based on Wildcat, the max. allowed case length is 2.233 in / 56.72 mm, the max. cartridge length is 2.775 in / 70.49 mm, and the max. allowed pressure is 48,200 PSI / 3,323 bar.

Load Specifications

ImperialMetric
Bullet:.257 | 75gr | HP Varminter
Cartridge:.257 Ackley Improved load data
Case Length (L3):2.333" | 59.3 mm
Cartridge Length (COL/L6):•••
Seated Depth:0.313" | 8.0 mm
Case Capacity:63 gow | 4.08 cm³
Primer Size:Large Rifle (LR)
Max. Pressure (Wildcat):48,200 psi | 3,323 bar
Barrel Length:24.0" | 610 mm
Min. Twist Rate:Stabilizes in any common twist

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Community Loads for .257 Ackley Improved + 75gr Sierra HP Varminter

Real loads for this combination shared by our community. Charge weights are only fully visible with an active Pro licence.

PowderCharge (gr)C.O.L.Barrel LengthVelocity (fps)Pressure (psi)

Charge weights beyond the first rows and all pressure values are only visible with an active Pro licence.