I changed the bunker value thing from 10 to 20 and it appeared to do nothing so i set it back. I DL'd Websters DG mod and looked it over throughly and found a part in
library+USsubparts+Dec_gun_4_50 .SIM
and the respective 3_50 gun and opened it with S3D. Inside that there is a thing titled "WPN_Cannon" and attached "WPN_Cannon7" click on that and in the property tree i found "Ammo_Storage" and changed the value from 150 HE to 300 HE.
Again thank you both for helping me because otherwise id be lost and a little miffed that we couldn't have swiped a few more rounds from the armory before leaving dock lol.