You can even throw at Extreme range, which in the example above would be 36 metres. The penalty to hit doesn't matter much, as missing only means you will scatter by 1d5 meters.
And a Frag has a blast radius of 4, so only in 1 of 5 misses will you actually miss
This means that even the most inept thrower (low BS) will be effective with Frag grenades at up to extreme range with an 80% hit rate. Nice, eh? That and flamers are the poor shooters friends.
Edit: I see they've reduce the Blast value to 3 in DH 2.0, which does reduce the chances in the above example from 80% to 60%. Still not bad, but not that great either.
Edited by Darth Smeg