I have been flying the P-51D for about 1 week vrs the (shudder) F4U-1C i flew the week before.
At first i thought oh these .50s are pathetic. Oops, my mistake it was my gunnery that was pathetic.
Any time i took the snapshot or a low percentage shot,i was left with a feeling of definite underpowered guns.
But when i had a good firing solution the .50s were devestating.
Further film review revealed to me that the key is concentration of fire in a single area.
Having your convergence set properly helps.
3 memorable sorties(not vulches) i had last night were 4 kills 2 assists, 5 kills , 3kills 2 of which were B17s!which I concentrated fire on the tail section where the tail meets the fusulage.Quite effective really but dangerous.

Since i have flown the P-51D i have had many 3+ kill sorties in tough gun shooting turning situations.
But snap shots are another matter eg.i filled a 109 full of lead on 3 high G snap shots with no damage to the 109 at all that i could visualize. Not the first time that has happened when i took low percentage shots
Now in terms of "realism" the kills i had attained on those 3 sorties, any pilot would be happy with.
Does any one know what the single sortie kill record is for a P-51 in WW2? (5)?
In version 1.02 the tweaking of ballistics might make a difference in the .50 cal during snap shots.
However untill i see a change from that i still believe my gunnery is to blame and not the guns.
The Ponys a pretty good ride the guns are adequate,its the arguement that might be overmodeled

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Some of my best Flying
is done AFK