5.56 long range ammo question

[556shooter]

I have always used blackhills mk262 77gr otm to test the longer range accuracy out of my ar15's and noticed many manufacturers also say tested with blackhills mk262.
Recently I have seen many people saying the spread is not as consistant as it once was.
Did something change with blackhills or are the other manufacturers just get better like Hornady, federal gmm and magtech? At $1 a pill you kind of expect consistancy and reliability.

 

[rdsii64]

25.2 grains of AA2520
lake city brass
hornady 75 grain T2 bullet
milspec primer

 

[MudRunner2005]

Probably something different in their powder batches that they're purchasing from the powder companies.

 

[jbs2014]

If you roll your own you can get really good results from a 24" barrel, 77 grain TMKs, Fed AR primers, and Ramshot TAC. Just put the slightest amount of crimp on the bullet. Only enough to prevent it from moving forward when your AR chambers a round. I have a load that gives me a consistent 15 FPS ES with the previously mentioned combo.