What will my actual rank be?

Wassup gamers. Just started playing Ranked after I quit CoD at the time BO4 came out. I was pubstomping in MW2, MW3, BO2, Ghosts, and AW. I just hit Gold 1 on a purple win-streak flame. Haven't lost a single game since I started playing Ranked.

I gain around 250 SR per game at Gold 1. Since I just came back to CoD, I obviously have no idea how MM works or if it has changed at all. What will my actual rank be at a gain rate of 250 SR at Gold 1?