I'm not sure it makes all that much difference with NATO FMJ.
Where I see difference is out of carbines. When you push the rounds out to 100 yards from a 12-16 inch barrel you start to see some difference.
At ten yards the energy difference is mostly expended behind your target.
$0 of an NRA membership goes to legislative action or court battles. Not a dime. Only money contributed to the NRA-ILA or NRA-PVF.
Of course, you could just donate to the Second Amendment Foundation
I was feeling pretty good, then I looked around and realized I am not swimming or on fire.