Having a shiny interior does not make it a meteorite. My best guess, based on the images provided, and it being attracted to a magnet, is high iron basalt similar to what is in my driveway.
The best way to determine if it is an iron meteorite, without taking it to a qualified professional (preferred), is to polish that spot you ground off to between 4000 and 10000 grit, apply dilute nitric acid, rinse thoroughly, and look for a widmanstatten pattern on the polished and etched portion. A magnifier should not be necessary.
When I did lapidary, I did that very thing to well over 1000 rocks for others. Only a few had a widmanstatten pattern.
Please do inform the forum of the results.
Time for more coffee.