Does anyone know what powder Federal uses in their 357 Sig 125 gr. Premiums? Years ago while at a Nashville gun show, an ammo maker out of Alabama said Federal used a "low flash" version of N350. I pulled a factory bullet to compare the powder with N350. Looked very close, but obviously I have now way to confirm. It definitely wasn't ball powder though. I have yet to find a comparable powder that produces such low muzzle flash. N350 is probably the best I've tried so far.