Steel filings in one rear brake drum

[supergnat]

I removed the driver side rear drum and found steel filings all over. This rear wheel has a modern lining that appears to have been filed across the lining and not in the direction of the wheel rotation. Could this cause the buildup of filings. I also notices two fresh wear spots. One on the drum (see photo) and one on the the center toggle link pin (see photo). I actually suspect that the drum is seating too far on to the axle and don't have any idea how to fix that. I would certainly value your opinions. I will be installing new woven linings. The drums are original steel and in excellent condition.

I had trouble adding photos from my iPad. Moved them to the PC. Hope this works. Thanks for the responses so far.

I've added the additional photos as requested by Tom. I have the self adjusting system with non-adjustable brake rods.
Thanks,
Supergnat