WesWorld

DFox,

The US 105mm field guns and howitzers would, here in WW, be 4" weapons.

Not good, looks like I will have to regun my self-propelled artillery (as they use South African naval 105mm guns)

Note: The 50cal rifle was a last minute addition. It is basiclly a 50cal machine gun stripped down and converted to a bolt-action rifle. The 50cal MGs was the standard US AT gun of the period but was too heavy to carry around, hence the need for a lightweight version.

The US is looking into the 0.60 inch cartridge (15.2 x 114mm) as an anti-tank rifle round, with the T1E1 as the rifle to fire it.

Naval guns as self-propelled weapons are fairly unlikely at this point in time: the vast majority of army indirect fire weapons are howitzers, because they fire more destructive shells on different trajectories and are less affected by intervening terrain than guns are. The main advantage of the longer-barreled, higher velocity guns is that they can shoot farther, but that's of limited value in any role other than counter-battery. The downsides are that, because of the flatter trajectory, any intervening terrain has a larger blind zone behind it, and the shells (for a given bore size) have less explosive filling.

True, but the 105mm came about since I have 7 South African guns (from the Tree class minesweepers) and nothing to do with them, so I decided to stuff them into the AT-27 tank chassis. I'lll probably just regun them with 102mm howitzers once the stock of 105mm ammo runs out.