Stu,
What doesn't help us, is that some powders like Curtis and Harvey's, used a different grading system.
In their case TS2 was finer than TS6! No 4 powder being the "middle of the road" and used a lot in shotguns. It may well be that you recall No 4 powder, which is a world different from the regular 4F we see today.
All the best,
Richard.
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