Commando Archive

Ok, I know the radius of the blast for the grenades, when you do an examine. But has anyone attempted to see if they are correct. It seems to me that I'm getting caught in the blast of some grenades even when I'm outside the radius. For example my imperial detonators have a radius of 4m from 10M away I shouldn't take any damage. For some reason sometimes I do?

Just wondering if anyone has done any testing with these. Thanks for the help