Ammunition Components & Ballistics Manufacturing worked example

Projectile Weight Variation Screening Calculator at 1.73% target maximum out-of-window rate: a worked example

Push target maximum out-of-window rate up to 1.73% and the picture changes. This example computes every intermediate figure at that operating point. a quality engineer needs to compare out-of-window projectile weights with the lot target

The inputs for this scenario

  • Projectiles outside weight-control window: 34 projectiles (unchanged)
  • Total projectiles inspected: 2,500 projectiles (unchanged)
  • Target maximum out-of-window rate: 1.73 % (raised for this scenario; the documented default is 1.5)

Working through the calculation

  • Applying the documented formula (Actual out-of-window weight rate = projectiles outside weight-control window ÷ total projectiles inspected × 100) to the inputs above produces each figure below.
  • At this operating point the engine returns 1.36 % out of window for actual out-of-window weight rate, the number this scenario is built around.
  • At this operating point the engine returns 0.37 points for variation-rate gap to target.
  • At this operating point the engine returns 34 projectiles for projectiles outside weight-control window.
  • At this operating point the engine returns 2,500 projectiles for total projectiles inspected.

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.
  • It computes the percentage of inspected projectiles that fall outside the weight-control window and the gap between that actual rate and your target maximum. The value of this scenario is the size of the gap it exposes: that gap, priced out over a year, is the budget you can justify spending to close it.

Results at a glance

  • Actual out-of-window weight rate: 1.36 % out of window (headline result)
  • Variation-rate gap to target: 0.37 points
  • Projectiles outside weight-control window: 34 projectiles
  • Total projectiles inspected: 2,500 projectiles

Run it with your numbers

  • Every input above is editable in the live Projectile Weight Variation Screening Calculator calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.