I'm a 260 lover and thinking of making the jump to the 284 also.
Was wanting to run the 284 on a short action to use Tikka CTR magazines, but running the numbers is appear that the performance of a 162gr vs a 140/147gr will be very similar ballistically with the only advantage to the 284 being more energy down range at the cost of more recoil than the 260.
The 284 seems to really shine ballistically with the 180gr pills, other wise it doesn't seem to stand to far above the 260/Creedmoor range of cartridges (ignoring energy down range).
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