Mainsail, I'm sorry but you are totally wrong, and are missing the point. I'm not comparing the M16 with the P6. I'm simply making the point that more rounds are better ALL THINGS EQUAL... that means equal size of gun, caliber, design, etc.
It's simply nonsense to argue that anyone carrying a gun, exactly the same size and weight, would prefer LESS rounds.
I challenged anyone to find evidence that the number of rounds within the gun mattered in a gunfight. You haven't, and the examples you cited have little to do with capacity at all, whether in the gun or total.
Wrong. In the famous FBI shootout, two FBI agents shot while reloading and were unable to reload their revolvers because of hand injuries. McNeill, after scoring 2 head/neck shots out of 6 shots on Mattix, was shot by Platt in the hand and unable to reload his revolver and was seriously injured and knocked out of the fight. It would be easy to presume that his fate would have been better if he was only 1/2 or 1/3rd into a 12-18 round magazine of 9mm... not stopping to reload. His focus was on reloading (down on his gun) and not scanning for threats or firing on Platt as he moved to position.
Hanlon was shot in the hand while reloading his revolver and seriously injured.
Note, Grogan was able to get off 9 shots with his 9mm (14 round capacity) and credited with scoring the first hit of the gunfight, wounding Mattix before being killed with the .223. Give Grogan only 6 shot revolver, perhaps he doesn't score that first hit before being shot reloading.
The FBI report concluded that the Agents handguns were less effective due to low stopping power and reloading repeatedly under stress due to low capacity.
It was 8 FBI agents against 2 bad guys. The Agents had initiative, fired first, struck the first hits, and had better fields of fire (they were flanking/behind the criminals), and laid down fire from more directions.
Consider that Mattix fired only 1 shot of #6 buckshot and was taken out of the fight. Platt did a LOT of damage. Yes his weapon was a superior .223 but he only had to reload one time, firing 42 rounds in total with that. He also fired 6 shots total from two .357 revolvers. So he was responsible for firing 1/3rd of the 145 shots fired from 9 different people. The biggest advantage wasn't necessarily the ballistics of the .223 (while that surely did help it wasn't a death ray), as the shots were all within handgun range and nobody was shot through any heavy cover. Instead, it was the capacity of the rifle that was a huge benefit.
Against basically one target firing back the 8 FBI agents suffered huge casualties and barely won, due to underpowered handguns and troubles reloading.
Sure, reloads are possible, but why make it more complicated with artificially low capacity?
Back on OP surely the lessons of WWI and WWII, Korea, Vietnam, etc. couldn't have been lost on the designers of the P6.... that greater capacity is beneficial.