How about 6.5x55 Swedish?
Or a custom throat on a 30-06 barrel? I'm betting you could get respectable velocity out of 200gr Berger's with the correct throat length and some RL26?[/Q
While there are several cartridges that will get the job done well, I became addicted to the 6.5x284 for medium game hunting about 10 years ago. I have taken several big bodied Alberta mule deer(and the same number of big white tails) out to 1000 yards with my 6.5x284 loaded to 2975-3000FPS with 140 class VLD's. It's very accurate, has manageable recoil, great ballistics, and most importantly, with the high sectional density 140gr+ VLD's, it demonstrates excellent killing power over a wide latitude of range. I have never experienced feeding issues with any of my 6.5x284 rifles, including a custom build using a standard LA BDL/floorplate taken from a 30-06. No mods necessary. Maybe the feeding issue drama comes from the same crowd that suffers from the short barrel life neurosis.
Some of the big mule deer taken with my 6.5x284 between 400 and 1000 yards. All DRT with chest shots.
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I built a 6.5-06 AI out of a 30-06 Sako Deluxe Finnbear that I brought home from Europe. I've been using it for years shooting long range. It will reach out to 1000 for sure. I did opt to neck down Lapua 30-06 brass but it wasn't very hard. It did require some neck turning. Another option is to use 25-06 brass and neck up which is quick and easy. The only issue is that Lapua doesn't make it. Cheers!