Chris has outlined the issue very well, the problem will be with the coal you have available.
Anthracite when it is shoveled onto the grate in your LeisureLine stoker will be a handfull of individual pieces of coal. And they will stay that way till they get pushed off the end of the bed or grate.
Bituminous coal will tend to swell, stick together into one chunk, and quite possibly stick to the sides of the chute of the grate.
Bituminous is usually pretty 'dirty', that is it has lots of differing sizes of coal in each load, and lots of fines. So getting well screened coal will also be an issue.
I have a few buckets of bituminous arund here, I'll try screening some and try it in my Pioneer in my shop. Darn, I just put a new glass in the door, it's gonna be black in about 5 imutes of bitum burning
IF I find time I'll try this experiment tonight or tomorrow morning.
Chris the LL stoker is very similar to the one you own, we can compare side by side when you are here.