went to the range with a friend. we both had new 7prc rifles (diff actions). both using 22" carbon proof barrels +suppressed(diff brand cans) but having same barrel type made for a very good side by side comp.
I shot Federal ELD-X 175gr
buddy shot Hornady ELD-X 175gr
GOOD News: both rifles show very well, sub-moa. ELD-X's are just that good.
my rifle: Federal ELD-X *(very first 3 shots through new barrel were the slowest and then it sped up)
Average speed: 2,941.4 fps
Highest/Lowest speed: 2,903fps / 2,970fps *(take out very fist 3 slow shot and lowest speed was: 2,931fps)
Hornady ELD-X
Average speed: 2781.2 fps
Highest/Lowest speed: 2,810.4 fps / 2,752.8 fps
we did Swap Ammo 1 round each to see if its the rifle/barrel, but numbers followed the brand of ammo pretty closely.
Hornady ELD-X through my rifle clocked 2,820.9 fps
Federal ELD-X through buddy's rifle clocked 2,961.6 fps
again: both Hornady and Federal grouped sub-moa, i'll say my buddy shot a little better than me.
but if you're looking for most speed go with Federal.