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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 easily be excessive in others. All loads should be reduced by 10%,  and developed following safe handloading practices as represented in established reloading manuals produced by component manufacturers. Presentation of these loads does not constitute a solicitation for their use, nor a recommendation.
 

Cartridge: .257 Weatherby Magnum

  Rifle: Weatherby Mark V  Ultralight   Max COL: 3.250″
  Barrel: 26″   Reloading Dies: RCBS
  Max case length: 2.549″   Group distance: 100 yards
 Note: These loads are for the Mark V action only.

78.4Bullet Type Bullet
Weight
Bullet
Diameter
C.O.L. Net Water
Capacity
Powder
Type
Charge Primer
Type
Muzzle
Velocity
Muzzle
Energy
Group
Size
Sierra HP 1600 75 .257″ 3.075″ 82.0 Reloder 22 77.0 CCI 250 4005 2672 0.6
Sierra HP 1600 75 .257″ 3.075″ 82.0 Reloder 19 73.7 CCI 250 3995 2659 0.9
Sierra HP 1600 75 .257″ 3.025″ 81.4 IMR 4350 71.0 CCI 250 4020 2692 1.4
Sierra HP 1600 75 .257″ 3.025″ 81.4 IMR 4831 72.4 CCI 250 3920 2560 1.2
Barnes XLC BT 100 .257″ 3.250″ 79.9 Reloder 22 72.6 CCI 250 3680 3008 1.0
Barnes XLC BT 100 .257″ 3.250″ 79.9 Reloder 19 69.5 CCI 250 3620 2911 1.1
Barnes XLC BT 100 .257″ 3.250″ 79.9 IMR 7828 72.0 CCI 250 3640 2943 0.9
Barnes XLC BT 100 .257″ 3.250″ 79.9 H 1000 77.0 CCI 250 3625 2919 0.9
GS Custom HV Moly 100 .257″ 3.250″ 79.4 Reloder 22 72.8 CCI 250 3690 3483 0.6
GS Custom HV Moly 100 .257″ 3.250″ 79.4 Reloder 19 69.7 CCI 250 3650 3465 1.0
GS Custom HV Moly 100 .257″ 3.250″ 79.4 H 1000 77.4 CCI 250 3685 3016 1.3
GS Custom HV Moly 100 .257″ 3.250″ 79.4 IMR 7828 73.1 CCI 250 3710 3057 0.9
Berger Moly 110 .257″ 3.250″ 79.2 Reloder 22 69.6 CCI 250 3480 2959 0.9
Berger Moly 110 .257″ 3.250″ 79.2 Reloder 19 70.0 CCI 250 3415 2849 1.3
Berger Moly 110 .257″ 3.250″ 79.2 H 1000 74.0 CCI 250 3470 2942 0.7
Berger Moly 110 .257″ 3.250″ 79.2 IMR 7828 70.0 CCI 250 3500 2993 0.9
Barnes Triple Shock 115 .257″ 3.250″ 78.4 Re22 68.0 Fed 215 3407 2965 0.5
Barnes Triple Shock 115 .257″ 3.250″ 78.4 Re25 71.0 Fed 215 3416 2981 0.7
Barnes Triple Shock 115 .257″ 3.250″ 78.4 IMR 7828 69.0 Fed 215 3395 2944 0.7
Barnes XLC FB 115 .257″ 3.250″ 78.4 Re22 68.0 Fed 215 3407 2965 0.9
Barnes XLC FB 115 .257″ 3.250″ 78.4 Re25 70.0 Fed 215 3400 2953 1.0
Barnes XLC FB 115 .257″ 3.250″ 78.4 IMR 7828 68.0 Fed 215 3412 2974 0.3
CT Ballistic Silvertip 115 .257″ 3.250″ 78.6 Reloder 25 72.5 CCI 250 3380 2918 1.4
CT Ballistic Silvertip 115 .257″ 3.250″ 78.6 Reloder 22 67.6 CCI 250 3375 2909 1.6
CT Ballistic Silvertip 115 .257″ 3.250″ 78.6 H 1000 72.4 CCI 250 3390 2935 1.1
CT Ballistic Silvertip 115 .257″ 3.250″ 78.6 IMR 7828 67.2 CCI 250 3350 2866 1.4
Nosler Partition 115 .257″ 3.250″ 79.8 Re22 69.0 CCI 250 3391 2937 0.9
Nosler Partition 115 .257″ 3.250″ 79.8 Re25 71.0 CCI 250 3408 2967 0.9
Nosler Partition 115 .257″ 3.250″ 79.8 IMR 7828 69.5 CCI 250 3423 2993 0.6
Hornady BTSP 117 .257″ 3.215″ 79.0 Reloder 25 72.3 CCI 250 3380 2969 0.3
Hornady BTSP 117 .257″ 3.215″ 79.0 Reloder 22 66.0 CCI 250 3300 2830 0.9
Hornady BTSP 117 .257″ 3.215″ 79.0 H 1000 72.0 CCI 250 3370 2951 0.9
Hornady BTSP 117 .257″ 3.215″ 79.0 IMR 7828 67.0 CCI 250 3345 2908 0.7
Sierra BTSP 1630 117 .257″ 3.250″ 79.8 Reloder 25 72.5 CCI 250 3370 2951 0.8
Sierra BTSP 1630 117 .257″ 3.250″ 79.8 Reloder 22 67.0 CCI 250 3330 2882 0.4
Sierra BTSP 1630 117 .257″ 3.250″ 79.8 H 1000 71.0 CCI 250 3300 2882 1.3
Sierra BTSP 1630 117 .257″ 3.250″ 79.8 IMR 7828 67.5 CCI 250 3350 2916 1.0
Speer Boat Tail 1410 120 .257″ 3.200″ 79.0 Reloder 25 72.0 CCI 250 3350 2991 1.0
Speer Boat Tail 1410 120 .257″ 3.200″ 79.0 Reloder 22 66.0 CCI 250 3280 2867 1.0
Speer Boat Tail 1410 120 .257″ 3.200″ 79.0 H 1000 72.0 CCI 250 3255 2824 1.6
Speer Boat Tail 1410 120 .257″ 3.200″ 79.0 IMR 7828 67.0 CCI 250 3320 2763 0.5
Speer Grand Slam 120 .257″ 3.170″ 78.9 Reloder 25 71.8 CCI 250 3345 2982 1.2
Speer Grand Slam 120 .257″ 3.170″ 78.9 Reloder 22 66.2 CCI 250 3295 2894 1.1
Speer Grand Slam 120 .257″ 3.170″ 78.9 H 1000 71.0 CCI 250 3305 2911 1.3
Speer Grand Slam 120 .257″ 3.170″ 78.9 IMR 7828 66.8 CCI 250 3320 2938 1.0
Nosler Partition 120 .257″ 3.250″ 78.8 Re 25 71.5 CCI 250 3335 2964 0.9
Nosler Partition 120 .257″ 3.250″ 78.8 Re 22 66.0 CCI 250 3290 2885 1.3
Nosler Partition 120 .257″ 3.250″ 78.8 H 1000 71.0 CCI 250 3300 2902 0.9
Nosler Partition 120 .257″ 3.250″ 78.8 IMR 7828 66.2 CCI 250 3295 2894 0.6