How hot is too hot for a new set of brake shoes and drum to run???

[JMBT]

Hello all, it’s been awhile since I have been on. I had to take another break from the road, but now I am back hopefully for awhile.

Anyway, put new brake shoes, drums, and chambers on my old trailer, adjusted the brakes, then went out for a test drive. Two of the drums are running about 180 degrees after 100 miles or so, the other two, one is at 200, and the other about 240?? I have already pulled down the hot positions and everything looks fine. Am I worried for nothing??? (Also slack adjusters, S cams and bushings are relatively new too, only about 30,000 miles on them)

Thanks