Been googling a bit and found this very interesting study:
AGS - DD988 Conversion
If you go to page 5, it says 600 rounds per magazine of the "regular" 155mm rounds, but no mention on how many LRAP rounds.
Fast forward to page 16 and it says 320 LRAP rounds.
I presume this is 320 LRAP
or 600 "regular" 155mm rounds?
It's interesting because these study was done on a Spruance-class destroyer... a ship which was NOT designed with the AGS in mind. I guess for the Zumwalt which is designed for the AGS, then it should be able to carry no less than 320 LRAP rounds per gun? So if you have 2 AGS in each Zumwalt, you could probably have 1 gun will all LRAP and 1 gun with all regular rounds or a combination of either 1200 all "regular" rounds or 640 LRAP rounds.
That's a LOT of projectiles.
It's also very interesting that the Navy is working hard on getting as much commonality with the AGS rounds -- both "regular" and LRAP -- with the US Army 155mm rounds.
Pretty exciting stuff!
Now only if the USN can make this a reality