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Calcimator

Reloading Data Calculator

Calculate powder charge ranges, case _fill percentages, and estimated velocities for handload development. Not a substitute for published load data.

Inputs

gr H₂O
gr
gr/gr H₂O
gr
gr
gr

Results

Load Steps

11

Est. Start Velocity2,371 fps
Est. Max Velocity2,512 fps
Start Fill %77%
Max Fill %86%
Rounds per Lb Powder161
Est. Cost per Round$0.62
Start Pressure49,200
Max Pressure55,200
How to Use This Calculator
  1. Enter Case Water Capacity, Bullet Weight, and Powder Density.
  2. Set Start Charge, Max Charge, and Charge Step.
  3. Review the Load Steps result.
  4. Use Est. Start Velocity (fps) and Est. Max Velocity (fps) to inform your decision.
  5. Use the chart to visualize the results and explore different scenarios by adjusting inputs.

How the result changes with Max Charge

Max ChargeLoad Steps
17-47
459
8079
109137

What each input means

Case Water Capacity
Case capacity in grains of water (e.g., .308 Win ≈ 56 gr).
Bullet Weight
Bullet weight in grains.
Powder Density
Powder bulk density relative to water (most powders 0.85-1.05).
Start Charge
Starting powder charge weight per published data.
Max Charge
Maximum powder charge per published data. Never exceed.
Charge Step
Powder charge increment between load steps.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Case Water Capacity = 56, Bullet Weight = 168, Powder Density = 0.95, Start Charge = 41 = 6 input(s) provided
  2. Calculate Load Steps
    Load Steps
    11 = 11
  3. Calculate Est. Start Velocity
    Est. Start Velocity
    2371 = 2371
  4. Calculate Est. Max Velocity
    Est. Max Velocity
    2512 = 2512

Engine last updated . Checked against 2 independently-derived tests — how we verify calculators.

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