i use a hornady progressive loader with auto bullet drop as well as auto powder thrower . i guess i will have to weight each round before taking to the range.
The "man" that needs to be looking down is YOU, looking down into each case, to verify the presence of, and correct amount of powder, BEFORE seating a bullet. I realize that this is a pain, an extra, time consuming step, but here you have had a good example of how, sometimes, automatic loading set ups are TOO AUTOMATIC.
Yes, you got off lucky, and someone was looking out for you (or maybe for your rifle
), but if you don't change your loading process, it CAN happen again. And worse, consider that powder that didn't go into one case might go into another, along with the intended charge!
I don't know the amount/type of powder you are using, but if there is any room left in the case, an overcharge, due to malfunction of your press IS possible!!!
I realize one goes through a lot of rounds firing full auto, but considering you are shooting one of the ultra rare and expensive legally licensed MP44s, blowing one up because you were simply sloppy/in a hurry during reloading is an unforgivable error. Even if (or especially if) you have the wallet to handle it, its still a crime against history to the rest of us.
If your ears are up to it (mine no longer are) and you're not using a compressed load, shake each round and listen for the powder to rattle. However, this won't (probably won't) show you an undercharge, unless the sound is noticeably different.
Weighing each round won't work, unless you have pre-weighed and sorted your brass by case weight. Differences in case weight can hide differences in the weight of the powder charge.
Also, I would think that taking the time needed to weigh each round after loading, (even if that would work) would be more time consuming than the time needed to be taken to visually check each case for powder before seating the bullet.
Seriously, if it happened once, it CAN happen again (or something else might happen) unless you take specific steps to prevent it.
Good luck, and I do hope you take some steps to improve your QC to protect both your investment, and yourself!