His elk is dead. mtmuleyThe -06 is well effective long past 1000 yards with the correct bullet.
Decent 200-225 grain bullet, I’d say it retains sufficient energy well past 1100 yards even.
Ok, elk is said to be 1500 lb-ft, white tail, 1000 lb-ft.
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Having said that…
Comparing a 7mm to 30.06 load, the 7mm 190 gr can stretch you to 900 yards and the .30 cal 200 gr to 700 yards and still have 1500 lb-Ft of energy.
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Yes, I have a stevens 200 LA in .30-06 and I’m building me a .280 Remington on a Big Horn Origin action.
I chose the .280 over the .30-06 for this reason.
My personal requirement is an 8” paper plate first round hit out to 700 yards. That’s a 1.14 MOA accuracy. Just over 1” MOA.
Either rifle will be more than capable of that performance. The .280 will just do it better.