Originally Posted by Muzzlebrake

The best ever was the Paladin - until now. It's decendant the Crusader is being used by the Germans (or at least the Military Channel says so). A shame the US created it but doesn't have it.

As for most historically significant that would have to be the French 75 Modele 1897. That gun put an end to having to relaying the gun after every round and changed artillery forever. That gun was why WWI was an artillery war and why artillery is still the weapon that inflicts the most casualties on the enemy - other than aircraft of course.

The Crusader is a U.S design that was placed on the shelf due to funding, the Germans do not use it because they have their fairly new system called PZH2000, which is rated as one of the best Self propelled guns in the world for a European fight, they seem to have some barrel overheating issues currently though while in use in Afghanistan.

Originally Posted by AussieNick

I believe the Bofors 40mm should be on the list, and It'd be my pick.

Could be if you are using it for air artillery, or are you leaning towards the proxy switch type ammunition that it fires.