not sure if intended or not:

i had a SAGmill running with Flint for some time - level was down to 53%.
I finally managed to get some End Steel Grinding Balls - when i swapped them in instead of the Flint the used-Level stayed on 53% so to say my first ball is half wasted.

shouldnt the value reset ?

addition:
it seems to reset after first usage, so no balls wasted but just a minor gfx-glitch imho.

It's not wasted - the remaining 53% is from the previously consumed Flint.

thats what i said.
i would have expected the used-level to reset to 100% upon inserting those steel balls, tho.

And waste the previous ball?

IT consumed the flint and decreased to 53% it wont use a grinding ball till it hits 0 then consumes one grinding ball and resets to 100%

Ah, so this works as intended and I just didn't get it.