Strange residue after shooting old hodgen fffg

[flintboomer]

I don't know if you ever came up with an answer for this, but someone at a match recently said that with the old powders if you had the load "just right" there would be a few little red dots in the fowling when you cleaned. That sounds a lot like what you had but I have no idea whether that theory is true since I never heard of it before and I don't remember seeing it myself.

[Hanshi]

I will not swear this is fact but the red dots are probably sulfur