Whether you are jinxing or not, I will give an honest answer.
It will have a solo release on that first week, and that is more than enough to do huge business if the movie itself is good.
Simmba won't move from that date, because business is business and isme koi dosti nahi chalti.
Now about 300cr, as I have said before, this movie will either be rejected or become huge, no middle ground.
In case rejected it will do just over 100cr. And I currently believe it will be because it's a huge risk and SRK doesn't have that trust right now to bring the audience in to watch something like this.
Plus ALR has never been tested on this level before. TWMR cost 39cr, and this one will cost at least 200cr more. The biggest jump a director has ever seen.
But if this movie is accepted, then it will wreak havoc.
It isn't just a typical rom-com type movie. It has enormous scale for a movie of it's kind, there is SRK doing something totally different, so many stars are doing cameos, there is even some action (recently FAN action director was on sets to direct an action scene).
I don't believe "inside" reports, but if we go by them then the team is really trying something special.