Marco,

The simplest way would be to take advantage of paragraph 4.1.3.1 which states Alternative methods for size evaluation maybe used provided that they can be correlated to to the weight method and are acceptable to the purchaser.

AMS 2430 Table 1 Size uniformity in machines uses sieve analysis for both Cast Shot and Wire. I would use that as your correlation proof. Using AMS 2431/1Table 4 you could develop your own screening requirements based on size. Example 70 cast steel = 12 CCW, 110 = 14, 170 = 20.

This is a heck of a lot easier then measuring shot with a micrometer. I will bring this up at the next SAE / AMEC meeting.

Hope that helps,

-Walter