What speeds are you getting? I did a ladder test Friday and my fastest velocity was 2452 FPS with 143 ELD-X and with 42.2 gr of AA4350.

Wow, I guess the 4350 family 'aint all that interchangeable.

My 143 gr. ELD-X load uses 41.6 gr. H4350, Hornady brass, & Federal primer. ~2.805" OAL. From a 22" barrel I'm just under 2650 fps MV.

It's you and the bullet, and all the rest is secondary.