• Reloading the .45-70

      Here is load data for Marlin 1895G .45-70, using South African Somchem powders. Scale used was an RCBS 1500 , chronograph a CED M2.

      Load data is with 400gr lead, Hornady 350gr RN and Impala 250gr monolithic solid.

      If you choose to duplicate any loads here, or use these loads as a basis for your own, use 10% less powder and work up from there.

      Do not attempt any of this if you have no chronograph to verify bullet velocity.

    Caliber Case Primer Powder Bullet Charge AOL Velocity Altitude
    .45-70 Winchester PMP S335 400gr lead 46.4 gr 65.2 mm 1109 fps 1700 m / 5100 ft
    .45-70 Winchester PMP S355 350gr RN 58.6 gr 65.5 mm 1550 fps 1700 m / 5100 ft
    .45-70 Winchester PMP S335 350gr RN 53.1 gr 65.7 mm 1503 fps 1700 m / 5100 ft
    .45-70 Winchester PMP S335 Impala 250gr 55.0 gr 64.7 mm 1850 fps 1700 m / 5100 ft
  • Additional [ Unverified ] Load Data

      This additional data provided by Manie Johannes from Somchem.

      IMPORTANT NOTICES:

      1. NB!! Always start loading at the recommended minimum (start) charge/load, work up gradually in increments of 1.5 to 2% of the nominal charge, closely observing for pressure signs.

      2. No liability is accepted, either expressed or implied, for damage or injury, arising from, or alleged to have risen from the use of the above information.

      3. When a particular caliber is not tested by Somchem, it will be indicated as such. If and when information is provided, it will be based on overseas data with propellants which is similar (never equivalent!) to the Somchem products. This information must serve as a guideline only, and must be treated as such. NB! It is very important that velocity is measured with the suggested start load, and compared with the estimated velocity.

      4. Maximum limits:

        4.1. If velocity can be measured, do not exceed the maximum published velocity value

        4.2. If velocity cannot be measured, do not exceed the maximum charge.


    Caliber: 45-70 Government
    Pressure limit: 28000Psi (SAAMI) Marlin
    Powder Bullet Weight Grains Start Load Grains Start Load Velocity fps Max Load Grains Max Load Velocity fps
    S321 300 43 1700 - 1800 50 1850-1950
    S321 350 42 1600 - 1700 48 1700 - 1800
    S321 400 39 1400 - 1400 44 1850-1950
    S321 500 32 1100 - 1200 37 1200 - 1300

    Caliber: 45-70 Government
    Pressure limit: 40000Psi Ruger no 1 etc
    Powder Bullet Weight Grains Start Load Grains Start Load Velocity fps Max Load Grains Max Load Velocity fps
    S321 300 56 2000 - 2100 62 2100-2200
    S321 350 48 1700 - 1800 54 1900 - 2000
    S321 400 46 1650 - 1750 52 1750-1850
    S321 500 40 1300 - 1400 44 1400 - 1400