What's the best grain AK-47 bullet for hunting whitetail?

[NaturalSelector]

I recently saw some 154 grain at a local gunstore, but all I had ever seen until then was 122, 123, and 124. Is this a better hunting round? Also, does it have a worse trajectory than lighter grains? Does it jump much worse, than say, a 124 grain? In your opinion, what grain should I choose for hunting between 100 and 400 yards?
G21, good point with the twist rates, and don't worry I know the limits of my rifle. I customize it a lot, and it is a little better than most. It has about a 2" MOA. That means at 400 yards, around 8" off. A whitetail's kill zone is 16", and trust me, it has the power to kill humanely at that range, if you hit the kill zone. Don't worry, I won't miss; not with the set-up me and my buddy have. You would have to be mentally impaired to miss from a 40 ft tall stand, with a window sill to prop your gun on, and a 16x scope. Besides, he has a R-700 .270 waiting to finish it if I miss.

 

[Hook]

Stick with the 124gr Super-X Soft point Ammo. delivering 2033fps @ 100yds. ( 7.62x39 is equivlant to 30-30 Win. ) The 7.62x39 is really only good at ranges below 200 yards. but where in the woods will you ever get a 400 yd shot anyway? Match the Rifle and Ammo to the conditions you'll be hunting in,
For all around Hunting, opt for 30-06, 308, or 7mm. in a non military Weapon

 

[G21e45]

The weight of the bullet is plenty important. If it doesn't match the twist of the rifling you'll get really lousy long range accuracy. An AK's typical twist rate of 1:10 isn't going to do well with the heavier 154 grain bullets. Suggest you stay with the 120 + grain bullets.

PS: You don't want to be, 'popping off' at deer at 300 + yards. Apparently nobody's told you that what you have, there, in an AK is essentially a reasonably accurate 230-240 yard carbine - not more.

(Ignore the military ballistic charts, they're often overstated.)

 

[ink]

the grain isn't as important as the ballistic tip of the bullet .get a good hollow point