basically once ur mag goes into ur gun, ur weapon has been reloaded, but there is a delay as the animation takes place..

its different from gun to gun, some mag goes in, some must cock aswell... in promod, once u see ur ammo counter reload, then u can just cancel it buy quickly double tapping ur switch weapon

or the easy way out is to use "weapnext;wait;wait;weapnext" bind.... most ppl use this bind on one of their mouse side buttons.. this bind just replaces the action of double tapping your switch weapon, it dosent reload for you, u still have to press R
an example of usage would be /bind MOUSE4 "weapnext;wait;wait;weapnext"


hope this helps!