Loads falling apart at distance.

I had issues at 2800 with them.
I've been running between 2800 and 2900 with the 147g ELD's in my RPR using Superformance for quite a while. My loads are still below the max load by .4g and are SAAMI length also and show no pressure signs and consistently shoot low .5 MOA's at 800 and 1000 yards. I haven't seen any evidence of bullets disintegrating either. Did the OP ever mention what gun he is shooting?
 
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I'd check

Scope

Paralax

The actual twist rate

ES/SD numbers - just because they were low for three shots after you erased the two bad ones doesn't mean they are gtg


3,000 fps in a 6.5 Creedmoor is some bullshit and so is Quickload - I'd start over, kiss lands, work up to pressure and back off to a flat spot on the chrony and I'd do it with Alpha or Lapua not Hornady brass.