Can anyone identify the various rounds in the 1/35 Italeri Modern Battle Accessories #6423? I think some are 120mm and some are105mm. Not sure if the rounds that seem to have no shell casings are 203mm?

Over all this is a pretty simple and some what crappy set but I feel I need to use it after paying good money for it.

Any help is appreciated.

From left to right on the top row:
105mm HEAT tank round
105mm HESH tank round
105mm tank round in carrier
120mm APFSDS (sabot) tank round
120mm HEAT tank round
155mm fused artillery shell
155mm unfuse (w/lifting plug) artillery shell
large artillery powder can
small artillery powder can

Hope that answers your quesations.

Those 155 projos are underscale diameterwise, but have the right length. However, you can make them work, especially if you're hiding them in the track. I feel bad telling you about the AFV Club set since you've already spent the money, but their projos AND powder cans are more detailed, plus you get the decals. There are a few usable items in the set- I think I used the sand channels and the fuel cans.
By the way, the small and large powder cans are generally referred to as Green Bag and White Bag.

Perfect! I had all the tank shells IDed then but was wrong about the arty shells.

Thanks for the help.

Ya. I have looked at the AFV Club set and will probably get it at some point to go with a M109 build.