NIA just used a FPS to Joules calculator and made our rules in Joules not FPS.
1-Close Quarters
1 joule or less for full auto
FPS-bb weight
328-.2
293-.25
CQB max FPS
1.14-MAX joules
FPS-bb weight
350-.2
313-.25
Use link to find out your joules
http://www.cimmerians.org/FPS_Converter.html?action=fps
2-Open Area
-Max 2.28 Joule Limit
FPS-bb weight
495-.2
443-.25
369-.36
338-.43
-Anyone over 1.49 Joule limit-Semi only
FPS-bb weight
400-.2
358-.25
298-.36
275-.43