True, if you load slow powders to magnum levels you won't have a problem, but what if you want a mid-range load? Trail Boss is a solution but outside of that even medium burning powders suitable for lower-power loads are going to leave room for a double charge.
What do you do? Load .44 Russian brass? Give up on the caliber? What about the .45 Colt? Is Trail Boss the only real solution outside of "process improvement"? I just don't think that "load something that fills the case" is always a practical solution.
I'll double down on precisely this comment. If it were Alliant 2400, AA#9 or H-110, no possible way to double charge. As a matter of fact, you could go way over book and make an unsafe load with the right powder but there isn't enough space in the case to do this damage when using any of the three I listed.
That's why on my Dillon 550 I do not use it as intended.
I interrupt the process by removing them from the shell plate as they move toward the powder station, Put them in a 50 round block, throw the charges by hand using a separate measure, looking at the powder levels in all the cases for uniformity, then feeding the charged cases back into the loader for the remaining seating and crimping stations.
Some of my ammo is used in 1866 and 1873 Uberti replica's, and I don't want to take a chance on having the awkward situation of a firing pin rod being driven back into my eye socket.
However... nope, sorry folks, you cannot reliably weigh a loaded round in hopes of catching a double charge of Titegroup. You would be looking to weigh a small amount and the variance in the weight of components will usually make for a pretty wide variance across a whole bunch of rounds.
Is there -ANY- chance that it was more than just a double charge? In a progressive, it is possible that if one got a double that another got a light charge or no charge, leading to the possibility of an obstructed bore. At that point you not only have a double charge of Titegroup but you have effectively doubled the bullet weight. That wouldn't just add to the catastrophe, it would multiply it.
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Hooray, the image finally attached!