Accuracy went to absolute hell above 2800 every time. It shoots 120s great at 3150. Same with 160s at 2975. I'll run 140s in something else.
I've had several 280; never felt comfortable enough with 160'a to come close to 2975, even in a 24" barrel.
And I've never seen a load published that will get you there either.
Just sayin.
Also never had a problem getting 140 BT's to shoot well either at around 2850-2900.
MM