Load data for .257 Ackley Improved + 87gr Sierra VarmintKing

253 suitable loads across 50 powder(s) for cartridge .257 Ackley Improved with 87gr Sierra VarmintKing bullet.

The most recommended powders for this combination are Somchem S365, Hodgdon Hybrid 100V and Winchester 6.5 StaBALL.

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.

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 | 87gr | VarmintKing

Cartridge:.257 Ackley Improved load data

Case Length (L3):2.333" | 59.3 mm

Cartridge Length (COL/L6):•••

Seated Depth:0.386" | 9.8 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:1:13.5

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Community Loads for .257 Ackley Improved + 87gr Sierra VarmintKing

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

Charge (gr)	C.O.L.	Barrel Length	Velocity (fps)	Pressure (psi)

47.9 gr	2.800"	26.0"	3150 fps	•••
49.1 gr	2.800"	26.0"	3225 fps	•••
50.3 gr	2.800"	26.0"	3300 fps	•••

•••	2.800"	26.0"	3220 fps	•••

•••	2.800"	26.0"	3222 fps	•••

•••	2.800"	26.0"	3183 fps	•••

•••	2.800"	26.0"	3056 fps	•••
•••	2.800"	26.0"	3132 fps	•••
•••	2.800"	26.0"	3215 fps	•••

•••	2.800"	26.0"	3127 fps	•••
•••	2.800"	26.0"	3211 fps	•••

•••	2.800"	26.0"	3280 fps	•••

•••	2.800"	26.0"	3254 fps	•••

•••	2.800"	26.0"	2967 fps	•••
•••	2.800"	26.0"	3061 fps	•••
•••	2.800"	26.0"	3153 fps	•••
•••	2.800"	26.0"	3245 fps	•••

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