I have noticed that for most nations the warhead size and projectile size for Pistol is 1. The following nations have a warhead and projectile size of 0.
Australia
Canada
Czechoslovakia
Great Britain
Hungary
Poland
Turkey
As these nations are in the minority it would appear that warhead and projectile size 1 is correct and ought to be consistent across all nations. Either that or they have only got water pistols!
regards,
Tim