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In a quick "google" I found....Today I trimmed a zip lock baggie full of 9x19 brass that I would not reload ( odd headstamp ) to 9x18 for my Makarov.
I have trimmed 9X19 down to 9X18 for years and have had good luck with it. Most likely after they have been fired, they are formed. The difference is .356 to .363 bullet diameter.In a quick "google" I found....
View: https://www.reddit.com/r/reloading/comments/mgj12f/how_can_i_convert_9x19_brass_to_9x18_makarov/
Looks like a Mac bullet is a little larger and may be enlarging the trimmed 9mm Para case to the point of not chambering. Bummer, considering.....
A little pricy. and boy howdy, finding your spent brass at the range.
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9MM Makarov Brass - Small Pistol - Brass Cases
9MM Makarov, or 9X18mm, uses a .363" diameter bullet. Used in the small Makarov surplus pistols that are readily available now in the United States.www.starlinebrass.com
Hmm. .007" seems like a substantial difference when we're talking chambering cartridges. But if it works....I have trimmed 9X19 down to 9X18 for years and have had good luck with it. Most likely after they have been fired, they are formed. The difference is .356 to .363 bullet diameter.