.284 will get you 100-200 fps more than a 7mm08; prob more like to 150-200. For brass, if you want Lapua, I would just get 6.5-.284 brass and use that ... it will prob feel a little dirty taking 6.5-284 brass back to the parent case :)
If you want easier more convenient, 7mm08 would fit your needs as well and be an off the shelf alternative. You could even likely use the factory barrel.
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