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When I first started handloading it was 14 years ago and I was doing 223, 308, and 9mm.
I tried to combine all the powders and all the bullets for 9mm, work them up to over load failure, and record the info in a spread sheet. I put in hundreds of hours in 1999 and 2000 filling in the cells of spread sheets for 9mm.
Looking at a spread sheet from 2000 for 115 gr and Blue Dot:
There is no data. It seems I could only fit 9.7 gr of Blue Dot under a 124 gr which was very wimpy, 7.9 gr being max listed by Alliant. 23% over book was not impressive.
And with 147 gr, it looks like I only shot 8.7 gr, wimpy again, being only 50% over the 5.8 book load.
Blue Dot did not have the speed*density product for me in the small 9mm case, in my quest for the most powerful and small concealed carry weapon.
But I have gone through 10 pounds of Blue Dot in the .223, where Blue Dot's peaky nature helps it burn clean.
Two weeks ago I went to the range and shot a 223 I built. This is the first group out of the new barrel, using Blue Dot at 100 yards.
While Blue Dot might be a safe powder for 9mm as it would be hard to put too much in the case, the flip side of that in 223 is a problem. Blue Dot can hang up in an RCBS Uniflow powder meter, giving a light charge and then an over charge. That could get serious in a 223. I would not want my kids putting Blue Dot in a .223. Every case must be checked to see it has the right fill ratio.