I am very serious and well researched.
When you get into reloading, it's crucial to learn the correct terminology. A shell contains more than one projectile, unless it is for artillery. There are 9mm shot shells made, though it has been a long time since I've seen shotshell capsules made for 9mm for reloading. From your Thread title, I thought you were talking about shotgun shell reloading. The correct term for a single projectile fired in a rifled barreled firearm is a cartridge. If from a smoothbore, the correct term is slug.
Now that the terminology is clear, as others have said, your loads were light, hence the sooting, and you had one with little or no powder.
I did 10 measure tests when setting up the drum tweaking it until it gave consistent 5.3 pours.
First mistake right there. Using a powder measure as a beginner, especially a drum type. . Powder measures "weigh" by volume, and are subject to inaccuracy, both in weight, and in literal accuracy in the final product.The powder can also 'bridge' in the drum, causing a low or no charge, which is most likely what you experienced. Charlie 98 has a good bit of experience with drum measures, if you continue using yours, I suggest PM'ing him on that subject.
Not speaking for others but I’d rather think any one hand loading has experienced squibs.
I Use Lee Dippers and a 505 scale to weigh my charges. I have never had a squib load in a metallic cartridge in 40+ years of loading. I have had them with my 12 ga. shells, and for the reason I mentioned. The MEC 600 Jr. weighs by volume with a bushing, and you can't easily see the drop. You have to remove the shell from under the wad arm and carefully re-insert it to do so. Since I restarted loading shotgun shells, I've had one in about 6000. Cost me a 25 straight, too.
It sounds like you have the almost OCD level of concern toward reloading that it requires, and I am not trying to dissuade you. Just wanted you to get the terms right, and offer an option that might work better for you, at least to start with.