What do I think BMR Is? Or how do I calculate it? Hm?? Go to my thread;
https://www.askmehelpdesk.com/fitness/you-want-lose-body-fat-healthy-way-come-here-380692.html
And yes, since I am a NATURAL bodybuilder and have been all my life. I like to think I know a thing or two about bulking up correctly.
As for the "30 pounds" I gained 30 pounds in a year.
You don't necessarily need to eat " a lot" everyday, and you shouldn't. You should be eating within a boundary and not just pig out.
And you are right, nutrition is around 70% of building muscle. You are correct. However 500 calories over your BMR is not needed. It may be wise for uneducated beginners so they make sure they gain muscle and don't lose any. But in reality it really isn't accurate. It is like telling the new driver to stay within the three way road and not to go over on either edge instead of just telling them to stay in the middle.