I was wondering how far out can a a RPG impact cause damage to infantry. [How far is it leathel and what is the maximum range for injury]

An RPG is an inexpensive way to deliver an explosive payload a distance of 100 yards with moderate accuracy.

Accuracy limits the standard RPG-7 to a practical range of 50 m, although it can reach 150 or even 300 m in skilled hands. It has an indirect fire (bombardment) range to 920 m, limited by the 4.5 second self-destruct timer.

As for lethality when the warhead goes off? Lets say you probably don't want to be within 25 feet of it when it explodes.

Well it varies quite a bit whether you're talking about HE-Frag, HE dual purose, HESH, or HEAT, all of which will give you different, often significantly so, answers.

New RPG-29 and RPG-27

New Russian weapons are showing up in Iraq, apparently smuggled across the Syrian border. One of the more dangerous has been the RPG-29. This is a larger version of the widely used RPG-7. With a ten pound launcher firing a 14.7 pound 105mm rocket, the RPG-29 warhead is designed to get past some forms of reactive armor (ERA). The larger weapon (3.3 feet long when carried out, six feet long when ready to fire and 65 percent heavier than the 85mm RPG-7) is more difficult to carry around and fire, but some have been captured, and the damage on some American armored vehicles indicate they were hit by an RPG-29 rocket. The RPG-29 has an effective range of 500 meters. The warhead can also penetrate five feet of reinforced concrete.

There is also a one shot version, the RPG-27, which weighs 17 pounds and has an effective range of 200 meters. Some of these have been found in Iraq as well. The RPG-29 and 27 are considered the "third generation" of the RPG family. The "second generation" was a failure, which the cheaper, and nearly as capable, RPG-7.

Both RPG-29s and 27s were developed and entered production just before the Soviet Union collapsed in 1991. They are available through legitimate, or black market, arms dealers and are more expensive than the RPG-7 (which is manufactured by many countries.) RPG-29 launchers cost over $500 each, and the rockets for about $300 each. The RPG-27s cost over $500 each. Its known that many of Saddams higher ranking supporters escaped to Syria with a lot of cash. Apparently some of it is being spent on RPG-27s and 29s.