Ummm.... I'm sitting here looking at 2 boxes of 7mm 180 grain Hybrids and They are marked with a G1 of .674 and a G7 of .345. Also, I went to the Berger page and don't even see the hybrid listed. So I'm not quite sure where you're getting your info.
your leaving out the 240 and 250 grain smk with bc in the high 6 low 7s and the 225 grain hornady match with a bc of .67.
with barrel length the same ie 24 vs 24 you WILL see 75 fps higher velocity on the 300 side. shooting the 225 rather than the 7mm 180 just facts also i don't know were you got your bc's for the berger but their web page has the hybred listed at .613 and the vld listed at .659. this puts both of them behind the all three of the bullets you leftout for the .300
my 300 with a 24" barrel is shooting hornady 225s at 2825 with .3 grains LESS than max recommended powder charge. i know there is not a load in the 7mm that will come close (by manufacturers spec)gun)