To put this in perspective...
500lb object impacting at 288mph=1,387,320 joules
500lb object impacting at 702.5mph=8,254,378 joules
200lbs of TNT detonating = 418,400,000 joules
That's over 50 times the energy from a 500lb 702mph impact!ok, ya have 2 bombs of equal size, and both filled with the equal amout of sheep pellets,...... One is dropped from a p-47 d40, doin say 288 mph, (for you math geeks)....the other is dropped by a f/a 18, doing 702.5 mph ( yeah we all know) which one will scatter pellets with more force over a larger distance? 
What is the altitude it is being dropped from? What is the terminal velocity of the bomb? Dropped from high enough, each could impact at a similar speed and trajectory (eg. the results would be a draw).