NONYA, perhaps you should check that "little chart" again. That's muzzle energy not velocity. Yup, the .30-06 has quite a bit more muzzle energy at the muzzle. And the .30-30 while limited to about 100 yards, still at that distance, has more energy in foot pounds than your .30-06 at 300 yards (with these particular Remington loadings). You have said that your .30-06 @ 300 yards can cleanly kill an elk. My entire point was, yes, so can the .30-30 at 100 yards.
The muzzle velocities for the two loads are separated by 500 fps for the .30-06 (2700 fps) and 170 grain .30-30 (2200 fps). With the 150 grain .30-30 (2390 fps), the velocity is even closer together, separated by only 310 feet per second.
http://www.remington.com/products/ammunition/ballistics/comparative_ballistics_results.aspx?data=R30065*R30301*R30302As to guides that wouldn't allow someone to carry the weapon on a hunt, they wouldn't get my business. It's all in the way and style of the hunt you want and terrain you hunt in. When my children are old enough to go with me to hunt elk and deer, they will be carying my '94 Winchester chambered for .30-30. It' trim, it's accurate, they will have plenty of range time, AND I'll teach them to get close and wait for the right shot. Just as my father taught me. Again, within the limitations of the cartridge, it will do fine. Every elk I've ever encountered I could have shot during elk season in NW Montana was well inside that 100 yard mark. We have a lot of thick heavy timber. Again, all to which the limitations of the .30-30 would be satisfactory.
ncpreacherboy asked if a .30-30 could kill elk humanely. And I think the question has indeed been answered very well. Yes it can, within the boundaries of the cartridge and the platform. He then asked if perhaps he should purchase another barrel for his Handi rifle. The answer to that has been, probably, if you'd like to be able to take shots in excess of 100 yards or so.