I'm not knocking Blue Dot...it's great stuff and is pretty versatile but, over the years, I have found that it's just not a good powder for .38 spl.
I've never had powder left in the cases, but I have seen plenty of unburned powder on the shooting bench (and my hands for that matter).
I finally stopped using it alltogether for target and plinking loads for the 38 for this very reason. However, it does seem to be pretty good for the higher pressure loads.
I have had a lot better results with W231 as my standard powder (38,45, 9x18).
700x seems to work really well too, but it's dirty compared to W231.
I'd suggest a different powder, I think you'll have better results.
My 2 cents.
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