Forget about the book on feed and speeds. Every machine, tool holder , tool length, coolant type, endmill quality IS different. If you are on BP mill try 600 rpm for HSS and about 1400 for carbide.
You only want a little color on the chips / swarf. If you see blue your endmill is done in HSS. Cobalt is a good choice for steel. Carbide is brittle. Needs alot of support ( heavy ridged spindle ) or its will crack on the edges. When I was employed on a large Haas mill, I tried the book to see how it would work. 3/8 4fl. carbide went about 3" then snap. Lol, this old dog doesn't need a book, it will let you know what it likes ( endmill ) and doesn't like. Roughing endmills breaks up the chips and tool pressure. Great way to rough out steel parts. You can run mills slower, but too fast will cost you money $$ €€