All I can tell you is that Federal's "XM" products are special products that were rejected by the end user. Why it was rejected, I couldn't say, but it could be something like not meeting required velocity or no primer seal etc.
I had some 9mm that was made for the Taiwanese Police that didn't meet their strict water proof sealing. It was a hot load using a 124gr FMJ with a metal disc sealing the base of the bullet and using lead-free priming. It was a very good round and I should have bought a case or two of the stuff.
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