I have both calibers and have used them extensively, I count on 2850fps w/ 140 Barnes TSX out of my model 7, I have custom model 7 7mm-08AI that runs around 2950 fps with 140 TSX and a 21" tube and 3200 fps w/120 TTSX. My Brno 22 with a 22" tube in .284 and a long throat spit 140TSX out at 3187fps with RL17. Also my 26" 7mm Weatherby runs 3300fps with 150g TTSX. I am in the process of converting the 4 guns to 2 and the 284 will be one of them that survives the downsizing. Actually have a NULA 24 on order in 284 from Melvin, this will be my go to gun if she shoots anything like his past builds. Anyhow if you like the 284 I have rechambered many 7mm-08s' and gained performance that I was happy with. Used Wyatt boxes and extended the OAL of the cartridge. Actually extended factory 700 SA's to 3.2" mag box. The action looks like a lengthened model 7 when finished. If you do not want to go through the trouble then the factory 7mm-08 is a great number as is. Hell as long as there is a 7mm in the name somewhere you can't go too far wrong!

7mm-08AI
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7mm Weatherby
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If it moves shoot it again!!