I didnt reallize this either oldelk. After looking at reloadersnest thats about it 100-200 fps. Powder capcity looks to be about the same...
6.5-06 thumps it fps wise...especially with heavier bullets...
That's actually verysuprising to me. The parent case for both (284 win and 30-06) have nearly identical volume- I've measured the difference myself and only found that the 30-06 case only holds about 4grains more water- and that can be attributed to the much longer neck on the 30-06 case not to mention that it hasn't been necked down yet.