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I'll be ordering some Federal American Eagle 9mm FMJ from Ammoman in the next month or so. I noticed that both of these are $79 for 500 rounds, but the 115 grain are $139 per case while the 124 grain are $155.
What are the differences between 115 and 124 grain FMJ? Is one more inherently reliable (or unreliable)? Is the NATO 9mm 115 or 124? What about recoil? I'm presuming an equal load will give more recoil for the heavier round, but I don't know if they're loaded the same.

This will be plinking ammo in 2 Beretta 92's, a SIG P226 and S&W 3913. They'll also be used for a shooting class my family and friends are attending. Should I just save the $15 and get the 115 grain, or is there a good reason I should get the 124? $15 isn't that big of a deal, but it'll let me get that much more .45ACP for my 1911!

TIA
 

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I went to ammoman.com and bought the AE 115,124,and 147gr 9mm. I shot them all sise by side and believe the 124 to be the softest shooting followed by the 115 then 147. They all have a different power factor. The best group also came from the 124.
 

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The 124 seems to be more accurate. None of these are NATO spec ammo, all are light target loads. The NATO spec ammo in Federal and Winchester will run about 1200 to 1300fps depending on the gun and barrel length. GLV
 

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As with the 230 grain 45, the original spec for 9mm when George Luger developed the round was for a 124 grain bullet.

Most 9mm weapons have been designed to optimize the performance of the 124 grain spec.

IMHO, there's little difference between the 115, and 124, though the 124 does seem to produce slightly better groups, probably a bit more stable in flight, though for plinking, the 115 is most common, and funtions fine for me.
 
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