割と詳しい情報があった
https://blog.cheaperthandirt.com/range-report-taurus-judge/
At about 15 feet, the鰀ederal 4 buckshot�load, carrying #3 buckshot, holds a cohesive pattern of less than three inches. This is a preferred load for those using the .410 load for personal defense.
The Federal load is advertised at about 750 fps but actually clocked over 800 fps in the Judge. The total payload is 292 grains.