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Way back in the day, when 9mm MAK cases were not offered as components and teh only 9mm MAK handguns you'd likely ever see where the occasional Vietnam bring-back, had to make MAK cases from 9mm. Really just a trim and expansion chore, so it's not all that bad.

From what I remember, the Unique loads worked out way back then aren't far off what is published today. Some 9mm cases are a bit thicker, so a bit less volume, but most 9mm MAK cases are pretty beefy (perhaps they come from the same factory drawing and heading dies as 9mm cases?).

Shouldn't get a full length 9mm case expanded to take a 9mm MAK bullet to chamber, should be a little too long. As yours does chamber, then suspect the headsapce is a little long...but in a blowback semi-auto, that's really not a problem. Suspect in a run of 10 or 20 9mm cases, you'll find one or two that are a little longer and may not chamber, and if you gotta trim them, then may as well trim them closer to 9mmMAK spec.
 
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