I cant speak for @25/08 IMP but my 20" creedmoor is doing 2820 with 143 ELDX aswell, it used to do 2920 when it was 24". I use FED215 mag primer in lapua brass & projectile is seated way out, barely fits in the mag ( 2.960 COAL ) to be able to do it.
For what your doing its really not necessary to chase that sort of speed. Even if you ran a light load of h4350 at around the 2600fps mark thats more than enough juice to take care of business well past your 300 ish goal.
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