I asked myself the same question (not whether it would equal, but would it get close). Obviously capacity is not there to equal.
I got some good input here about the 6.5/06 AI; according to the fellas here who have done it, it gets scaryclose with less powder than the 257 BEE.
Look in the latest reloading manuals and you will see the std. 6.5/06 not far off, nor the 6.5-284 Norma.
