diff --git a/runelite-client/src/main/java/net/runelite/client/plugins/cannon/CannonPlugin.java b/runelite-client/src/main/java/net/runelite/client/plugins/cannon/CannonPlugin.java
index bed1d16f22..598597911b 100644
--- a/runelite-client/src/main/java/net/runelite/client/plugins/cannon/CannonPlugin.java
+++ b/runelite-client/src/main/java/net/runelite/client/plugins/cannon/CannonPlugin.java
@@ -50,6 +50,7 @@ import net.runelite.api.coords.WorldPoint;
 import net.runelite.api.events.ChatMessage;
 import net.runelite.api.events.ConfigChanged;
 import net.runelite.api.events.GameObjectSpawned;
+import net.runelite.api.events.GameTick;
 import net.runelite.api.events.ProjectileMoved;
 import net.runelite.client.Notifier;
 import net.runelite.client.callback.ClientThread;
@@ -67,8 +68,10 @@ import net.runelite.client.ui.overlay.infobox.InfoBoxManager;
 public class CannonPlugin extends Plugin
 {
 	private static final Pattern NUMBER_PATTERN = Pattern.compile("([0-9]+)");
+	private static final int MAX_CBALLS = 30;
 
 	private CannonCounter counter;
+	private boolean skipProjectileCheckThisTick;
 
 	@Getter
 	private int cballsLeft;
@@ -202,7 +205,15 @@ public class CannonPlugin extends Plugin
 			//Check to see if projectile x,y is 0 else it will continuously decrease while ball is flying.
 			if (projectileLoc.equals(cannonPosition) && projectile.getX() == 0 && projectile.getY() == 0)
 			{
-				cballsLeft--;
+				// When there's a chat message about cannon reloaded/unloaded/out of ammo,
+				// the message event runs before the projectile event. However they run
+				// in the opposite order on the server. So if both fires in the same tick,
+				// we don't want to update the cannonball counter if it was set to a specific
+				// amount.
+				if (!skipProjectileCheckThisTick)
+				{
+					cballsLeft--;
+				}
 			}
 		}
 	}
@@ -234,44 +245,68 @@ public class CannonPlugin extends Plugin
 			Matcher m = NUMBER_PATTERN.matcher(event.getMessage());
 			if (m.find())
 			{
+				// The cannon will usually refill to MAX_CBALLS, but if the
+				// player didn't have enough cannonballs in their inventory,
+				// it could fill up less than that. Filling the cannon to
+				// cballsLeft + amt is not always accurate though because our
+				// counter doesn't decrease if the player has been too far away
+				// from the cannon due to the projectiels not being in memory,
+				// so our counter can be higher than it is supposed to be.
 				int amt = Integer.valueOf(m.group());
-				cballsLeft += amt;
+				if (cballsLeft + amt >= MAX_CBALLS)
+				{
+					skipProjectileCheckThisTick = true;
+					cballsLeft = MAX_CBALLS;
+				}
+				else
+				{
+					cballsLeft += amt;
+				}
+			}
+			else if (event.getMessage().equals("You load the cannon with one cannonball."))
+			{
+				if (cballsLeft + 1 >= MAX_CBALLS)
+				{
+					skipProjectileCheckThisTick = true;
+					cballsLeft = MAX_CBALLS;
+				}
+				else
+				{
+					cballsLeft++;
+				}
 			}
-		}
-
-		if (event.getMessage().equals("You load the cannon with one cannonball."))
-		{
-			cballsLeft++;
 		}
 
 		if (event.getMessage().contains("Your cannon is out of ammo!"))
 		{
+			skipProjectileCheckThisTick = true;
+
+			// If the player was out of range of the cannon, some cannonballs
+			// may have been used without the client knowing, so having this
+			// extra check is a good idea.
+			cballsLeft = 0;
+
 			if (config.showEmptyCannonNotification())
 			{
 				notifier.notify("Your cannon is out of ammo!");
 			}
 		}
 
-		if (event.getMessage().contains("You unload your cannon and receive Cannonball"))
+		if (event.getMessage().startsWith("You unload your cannon and receive Cannonball")
+			|| event.getMessage().startsWith("You unload your cannon and receive Granite cannonball"))
 		{
-			Matcher m = NUMBER_PATTERN.matcher(event.getMessage());
-			if (m.find())
-			{
-				int unload = Integer.valueOf(m.group());
+			skipProjectileCheckThisTick = true;
 
-				// make sure cballs doesn't go below 0
-				if (cballsLeft - unload < 0)
-				{
-					cballsLeft = 0;
-				}
-				else
-				{
-					cballsLeft -= unload;
-				}
-			}
+			cballsLeft = 0;
 		}
 	}
 
+	@Subscribe
+	public void onGameTick(GameTick event)
+	{
+		skipProjectileCheckThisTick = false;
+	}
+
 	Color getStateColor()
 	{
 		if (cballsLeft > 15)