It won't matter much, as I said, if we are talking about optimum condition, then yes, soft killing Javelin probably not going to do much, but then you aren't talking about a gap that much, because it would most likely the same outcome for an unguided RPG-7 to hit its mark and a Javelin to hit its mark.
I mean, if I am sitting down in front of a tank 450 meters to 70 meters and I have no obstacle between me and it and the ground is flat, I will probably be able to hit it with a RPG-7 as much as a Javelin laser jamming or not. On the other hand, if we are talking about complex condition, then that wouldn't matter much either, because your missile can't do much adjustment FoF, you fire that missile and it home in the target, it can't plot a course to by-pass or avoid obstacle.
not sure if that make sense?