280 Ackley Improved

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Handload Data

Warning: Bullet selections are specific, and loads are not valid with substitutions of different bullets of the same weight. Variations in bullet length will alter net case capacity,  pressure and velocity. Primer selection is specific and primer types are not interchangeable. These are maximum loads in my firearms and may be excessive in others. All loads should be reduced by 5% as a starting point for development where cartridges have greater than 40 grains in capacity and 10% for cartridges with less than 40 grain capacity following safe handloading practices as represented in established mainstream reloading manuals. Presentation of these loads does not constitute a solicitation for their use, nor a recommendation.

 

Cartridge – 280 Ackley Improved 65kpsi
Firearm Ruger M77
Barrel Length 24.00″
Min – Max Case Length 2.525″ +0.000″/-0.012″
Min – Max COL 3.136″ – 3.330″
Primer CCI 250
Bullet Diameter 0.2845″ +0.000″/-0.0030″
Reloading Dies Lee Precision
Bullet Type Bullet Weight
Grains
Net H2O
Grains
Capacity
COL” Powder Type Powder Charge
Grains
Muzzle Velocity
fps
Muzzle Energy
ft/lbs
Sierra Pro-Hunter
120 70.2 3.200 RL 17 60.5 3456 3183
Sierra Pro-Hunter 120 70.2 3.200 IMR 4350 60.5 3306 2913
Sierra Pro-Hunter 120 70.2 3.200 Win 760 60.5 3346 2984
Berger VLD Hunting
140
66.4
3.330
RL 19
60.0
3131
3048
Berger VLD Hunting
140
66.4
3.330
Hybrid 100V
56.0
3054
2900
Berger VLD Hunting
140
66.4
3.330
RS Hunter
60.5
3141
3068
Remington PSP 140 68.4 3.290 RL 22 63.5 3182 3148
Remington PSP 140 68.4 3.290 Norma MRP 64.0 3272 3329
Remington PSP 140 68.4 3.290 RS Hunter 61.0 3056 2904
Speer SP 160 66.4 3.300 RL 19 59.5 2981 3158
Speer SP 160 66.4 3.300 IMR 7828 SSC 60.5 2974 3143
Speer SP 160 66.4 3.300 Norma MRP 60.0 2896 2980
Berger VLD Hunting
168
64.6
3.330
RL 22
59.0
2839
3007
Berger VLD Hunting 168 64.6
3.330
Hybrid 100V
52.8
2775
2873
Berger VLD Hunting 168 64.6
3.330
RS Hunter
56.0
2806
2938
Remington PSP 175 65.6 3.285 RL 22 58.0 2745 2929
Remington PSP 175 65.6 3.285 Hybrid 100V 52.5 2680 2792
Remington PSP 175 65.6 3.285 IMR 7828 SSC 58.0 2756 2952
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