Here's a link to get you started:

http://www.remington.com/pages/news-...allistics.aspx

There's a balance between bullet weight and the velocity at which it's driven when it ultimately comes to performance of a particular caliber on game. Generally, you don't want to drive the bullet so fast that it doesn't have an opportunity to expand, nor do you want it going so slowly that it simply creates a superficial wound. Unfortunately, the trend today seems to be to drive a heavy bullet as fast as you can push it. In most cases, the heavy bullet never has an opportunity to expand and simply exits the animal on the opposite side of the hit. Now, some will advocate that this scenario allows for a better blood trail to follow - two wounds being better than one. While that's a great concept if you're bowhunting, it's inefficient when it comes to a firearm. If you transfer all that energy into the vitals of that animal and destroy them, the animal is going nowhere.

My experiences have led me to conclude that for deer-sized game, a bullet of 90-130 grains, driven somewhere between 2700 and 3000 fps, will kill an animal MOST EFFICIENTLY, provided the shot is placed in the vitals. I much prefer my .243s to my .30-06s for exactly that reason when it comes to deer and pronghorns.

Back to the .270/.30-06 comparo, though....

Remington lists basic pointed soft point Core-Lokts at 150 grains as available for both calibers. In terms of long-range trajectory, the .30-06 actually offers better performance if you're just wanting something that shoots "flat", 50.9 inches of drop at 500 yards, versus 61.2 inches for the .270 at the same range. NONETHELESS, if I were to hold my .30-06 50.9 inches high at 500 yards, and you were to hold the .270 61.2 inches high at the same range, both bullets would theoretically hit the same point of impact.

However, comparing the 150 grain .30-06 to a 130 grain .270, the .270 requires only 43.3 inches of hold at 500 yards, versus 50.9 for the .30-06. Again, provided each of us were to hold accordingly, both bullets would still hit the target.

But, back to my original conclusion, a 130 grain bullet tends to be more "deer-sized" than a 150, so were I just building a rifle for deer, given a choice between the .30-06 and .270, I'd pick the .270. If I were only going to own one rifle, and may have a good chance at hunting elk or moose one day, I'd want something that handles the heavier bullets better - the .30-06.