I am surprised to hear that the FNM ammo in any caliber is held in disregard anywhere. Years ago, we were offered surplus Portuguese 7.62 x 51 ammunition. It was before any Portuguese ammo was sold commercially
in the US, and originated as battlefield pickup in Angola. We were sent a sample of all mixed headstamp, dirty ammunition, 100 rounds, to test and see if we wanted ammo, with the guarantee (which proved correct) that
the ammo actually to be sent if we bought any would be clean, and not so varied. The sample represented culs that Fed Ord did not want to sell to their clients. I and my friend shot it in a match M1A (M14), a 40XB-BR Remington Heavy Varmint Class rifle with a 20x scope on it, and a nice FN-FAL Browning Commercial Lightning Model, the best FAL I had ever owned. We used a box of commercial .308 (I don’t recall the brand) hunting ammo, and 100 rounds of Lake City Match ammo for control. The mixed lot of Portuguese military ball, spanning about ten years of production and God knows how many lot numbers, shot half the group size of the other two, and was totally sure-fire and functioning-reliable in all three rifles. We ordered a large quantity of ammo which arrived in a far better state, most in its original boxes with lot and date integrity. It became so popular with our customes that they started requesting FNM ammo.
We never passed by any chance to get more NATO, and also sold some .303 and a huge amount of 8 x 57 mm. In all three calibers, it was the best ammo I ever shot in any of my rifles, other than my own handloads, or in the case of NATO, one box of Lapua Match Ammo I managed to acquire and shot in my M1A Match.
Their commercial ammo, although we never got much of it as we closed before it was widely sold, lived up to all expectations. The brass reloaded nicely as well.
Personally, I would, if I was still active with calibers made by FNM originally, not hesitate to purchase any of it I found. While my experience with PPU ammo has been generally good, the FNM was considerably better out of my guns.
Just my own observations.