It's about 38% last year on that gross, as I noted elsewhere (including FICA and state). But assuming no 401(k) or match isn't realistic either so it's actually lower.
I'm not really sure why you keep pushing back on all of this. It's just how the math works.
The short version is, if you make $300k year if you are careful with the money you can have 1 million in savings in (conservatively) 6-8 years just by doing the obvious things, assuming reasonably similar market conditions.