RE: 7mm vs. 30-06
i am of the bigger diameter bullet is better. the bullet may go a little slower but it will still do the job. and on larger game i prefer the penetrative power of larger weights of bullets so i would go with the 06, but if you are going custom you could get a wildcat(ish) cartidge like the 35whelen, or even the .338-06 which i believe has just entered factory relm as well.
propmahn
save the world, reload your brass