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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 5%,  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 Roberts +P

  Rifle: Ruger M77   Max COL: 2.780″
  Barrel: 22″   Reloading Dies: Hornady New Dimension
  Max case length: 2.233″   Group distance:100yards
 Note: Same loads with M77 Ultra Light 20″ barrel averaged 36 fps lower velocity.
+P approximately 58,000 PSI
Bullet Type  Bullet Weight Net Water Capacity COL Primer Powder Type Powder Charge Muzzle Velocity Muzzle Energy Group Size
Hornady FP 60 53.2 2.535 CCI 200 2400 15.0 2163 623 1.1
        CCI 200 BL-C2 51.0 3818 1943 1.9
        CCI 200 IMR 4895 49.0 3822 1947 1.6
Hornady V Max 75 51.9 2.780 CCI 200 Varget 46.5 3433 1963 0.8
        CCI 200 BL-C2 48.5 3471 2007 1.2
        CCI 200 IMR 4895 46.0 3486 2024 0.9
Sierra Varminter 75 47.0 2.700 CCI 200 Re 15 47.0 3490 2029 1.1
        CCI 200 Varget 46.0 3398 1923 1.2
        CCI 200 Varget 47.0 3494 2034 0.5
        CCI 200 H414 51.0 3555 2105 1.0
Barnes TSXFB 100 48.7 2.780 CCI 200 Re 19 48.0 3076 2101 1.2
        CCI 200 H4350 46.0 3081 2108 1.0
        CCI 200 RS Hunter 48.0 3090 2121 0.9
Barnes TSXFB 115 47.3 2.780 CCI 200 Re 19 45.5 2856 2083 1.0
        CCI 200 H4350 43.5 2821 2033 1.1
        CCI 200 IMR 7828SC 47.5 2793 1992 0.7
Sierra SP 117 49.2 2.780 CCI 200 Re 19 47.0 2853 2115 1.0
        CCI 200 IMR 4350 44.0 2820 2067 1.0
        CCI 200 RS Hunter 46.5 2838 2093 0.9
Hornady BTSP 117 48.7 2.780 CCI 200 Re 19 47.0 2845 2103 0.7
        CCI 200 H4350 44.5 2797 2033 1.4
        CCI 200 IMR 4831 45.0 2771 1995 0.9
Nosler Partition 120 47.8 2.780 CCI 200 Re 19 46.0 2764 2036 0.8
        CCI 200 IMR 7828 SC 48.0 2781 2061 1.3
        CCI 200 RS Hunter 46.0 2873 2200 1.2
Speer Grand Slam 120 48.9 2.780 CCI 200 Re 19 46.5 2839 2148 1.1
        CCI 200 H4350 44.0 2760 2030 0.9
        CCI 200 IMR 7828 SC 48.5 2845 2157 1.3