RAM, the .50s on buffs are no different than the .50s on any other American plane! The only .50s that are different are the ones on the halftracks, where they use the M2 heavy barrel 50 cal. In all cases, however, the 50 cal projectile is the same.
If it is the range you are concerned with, I suspect that this is due to the fact that the bomber is typically firing defensively in directions OPPOSITE to its direction of travel, thereby decreasing the drag on the projectile.
If you want to test this for yourself, have a buddy go up with you in the training arena. One of you in a B26, and the other in a P-51. Have the B26 trail the P-51 and fire at it with the bombadier's 50 cal. until you determine the max range that you can still get pings. Next, have the P-51 trail the B26. Have the pony shoot at the B26 until the max range can be determined.
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"....where'd who go!"
Troxel
VMFA-212 "Lancers"[This message has been edited by troxel (edited 08-05-2000).]