Ammunition Components & Ballistics Manufacturing worked example

Projectile Weight Variation Screening Calculator at 1.08% target maximum out-of-window rate: a worked example

Here is what the math looks like when conditions slip. We hold every other input steady and drop target maximum out-of-window rate to 1.08%, then walk the calculation through step by step. Calculate the share of projectiles outside the weight-control window from inspection count, sample size, and target variation rate.

The inputs for this scenario

  • Projectiles outside weight-control window: 34 projectiles (held at the documented default)
  • Total projectiles inspected: 2,500 projectiles (held at the documented default)
  • Target maximum out-of-window rate: 1.08 % (the input this scenario stresses; the baseline uses 1.5)

Working through the calculation

  • The calculation starts from the formula this tool documents: Actual out-of-window weight rate = projectiles outside weight-control window ÷ total projectiles inspected × 100.
  • Actual out-of-window weight rate works out to 1.36 % out of window at these inputs, and this is the headline figure for the scenario.
  • Variation-rate gap to target works out to -0.28 points at these inputs.
  • Projectiles outside weight-control window works out to 34 projectiles at these inputs.
  • Total projectiles inspected works out to 2,500 projectiles at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where target maximum out-of-window rate sits at 1.5% and the headline result is 1.36 % out of window, this scenario lands almost exactly on the baseline at 1.36 % out of window.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to target maximum out-of-window rate, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. A percentage out-of-window says nothing about the magnitude of the deviation; ten bullets one grain heavy and ten bullets ten grains heavy read identically, so pair it with the actual weight distribution.

Results at a glance

  • Actual out-of-window weight rate: 1.36 % out of window (headline result)
  • Variation-rate gap to target: -0.28 points
  • Projectiles outside weight-control window: 34 projectiles
  • Total projectiles inspected: 2,500 projectiles

Run it with your numbers

  • To rerun this with your own numbers, open the live Projectile Weight Variation Screening Calculator calculator, set target maximum out-of-window rate to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.