diff --git a/Data/Scripts/CoreSystems/Ai/AiFields.cs b/Data/Scripts/CoreSystems/Ai/AiFields.cs
index 230bf5a9..17d203da 100644
--- a/Data/Scripts/CoreSystems/Ai/AiFields.cs
+++ b/Data/Scripts/CoreSystems/Ai/AiFields.cs
@@ -69,7 +69,7 @@ public partial class Ai
         internal readonly List<SupportSys.SupportComponent> SupportComps = new List<SupportSys.SupportComponent>(32);
         internal readonly List<ControlSys.ControlComponent> ControlComps = new List<ControlSys.ControlComponent>(32);
         internal readonly List<WeaponComponent> PhantomComps = new List<WeaponComponent>(32);
-        internal readonly HashSet<Projectile> DeadProjectiles = new HashSet<Projectile>();
+        internal readonly List<Projectile> DeadProjectiles = new List<Projectile>();
         internal readonly List<Ai> TargetAisTmp = new List<Ai>();
         internal readonly List<Shields> NearByShieldsTmp = new List<Shields>();
         internal readonly List<MyEntity> NearByFriendlyShields = new List<MyEntity>();
diff --git a/Data/Scripts/CoreSystems/Projectiles/Projectile.cs b/Data/Scripts/CoreSystems/Projectiles/Projectile.cs
index 1c2c9d09..d31957e0 100644
--- a/Data/Scripts/CoreSystems/Projectiles/Projectile.cs
+++ b/Data/Scripts/CoreSystems/Projectiles/Projectile.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Diagnostics;
 using CoreSystems.Platform;
@@ -237,7 +237,7 @@ internal void Start()
                 {
                     Vector3D targetDir;
                     Vector3D targetPos;
-                    if (TrajectoryEstimation(Info.AmmoDef, ref Position, out targetDir, out targetPos, false))
+                    if (TrajectoryEstimation(Info.AmmoDef, w, ref Position, out targetDir, out targetPos))
                         TargetPosition = targetPos;
 
                     TargetPosition -= (Direction * variance);
@@ -3078,7 +3078,7 @@ internal void ForceNewTarget()
             Info.Storage.PickTarget = false;
         }
 
-        internal bool TrajectoryEstimation(WeaponDefinition.AmmoDef ammoDef, ref Vector3D shooterPos, out Vector3D targetDirection, out Vector3D estimatedPosition, bool isTimedSpawn)
+        internal bool TrajectoryEstimation(WeaponDefinition.AmmoDef ammoDef, Weapon weapon, ref Vector3D shooterPos, out Vector3D targetDirection, out Vector3D estimatedPosition)
         {
             var aConst = Info.AmmoDef.Const;
             var eTarget = Info.Target.TargetObject as MyEntity;
@@ -3108,11 +3108,7 @@ internal bool TrajectoryEstimation(WeaponDefinition.AmmoDef ammoDef, ref Vector3
             }
 
             var targetVel = eTarget != null ? eTarget.GetTopMostParent().Physics.LinearVelocity : (Vector3)pTarget.Velocity;
-            Vector3D shooterVel = Vector3D.Zero;
-            if (isTimedSpawn)
-                shooterVel = !Info.AmmoDef.Const.FragDropVelocity ? Velocity : Vector3D.Zero;
-            else
-                shooterVel = Info.ShooterVel;
+            var shooterVel = !Info.AmmoDef.Const.FragDropVelocity ? Velocity : Vector3D.Zero;
 
             var projectileMaxSpeed = ammoDef.Const.DesiredProjectileSpeed * (weapon == null ? 1 : weapon.VelocityMult);
             Vector3D deltaPos = targetPos - shooterPos;
@@ -3147,8 +3143,9 @@ internal bool TrajectoryEstimation(WeaponDefinition.AmmoDef ammoDef, ref Vector3
             if (timeToIntercept < 0)
             {
 
-                if (aConst.TimedFragments && aConst.FragPointType == PointTypes.Lead)
+                if (aConst.FragPointType == PointTypes.Lead)
                 {
+
                     estimatedPosition = targetPos + timeToIntercept * (targetVel - shooterVel);
                     targetDirection = Vector3D.Normalize(estimatedPosition - shooterPos);
                     return true;
@@ -3158,6 +3155,7 @@ internal bool TrajectoryEstimation(WeaponDefinition.AmmoDef ammoDef, ref Vector3
                 targetDirection = Direction;
                 return false;
             }
+
             estimatedPosition = targetPos + timeToIntercept * (targetVel - shooterVel);
             targetDirection = Vector3D.Normalize(estimatedPosition - shooterPos);
             return true;
@@ -3591,7 +3589,7 @@ internal void SpawnShrapnel(bool timedSpawn = true) // inception begins
                     }
 
                     Vector3D estimatedTargetPos;
-                    if (!TrajectoryEstimation(fragAmmoDef, ref newOrigin, out pointDir, out estimatedTargetPos, true))
+                    if (!TrajectoryEstimation(fragAmmoDef, null, ref newOrigin, out pointDir, out estimatedTargetPos))
                         continue;
                 }
 
diff --git a/Data/Scripts/CoreSystems/Projectiles/ProjectileGen.cs b/Data/Scripts/CoreSystems/Projectiles/ProjectileGen.cs
index f0ea8fa2..892b907f 100644
--- a/Data/Scripts/CoreSystems/Projectiles/ProjectileGen.cs
+++ b/Data/Scripts/CoreSystems/Projectiles/ProjectileGen.cs
@@ -225,7 +225,10 @@ private void SpawnFragments()
                         if (dumbAdd || validAi)
                         {
                             targetAi.DeadProjectiles.Remove(p);
-                            targetAi.LiveProjectile[p] = condition1 || condition2;
+                            if (targetAi.LiveProjectile.ContainsKey(p))
+                                targetAi.LiveProjectile[p] = condition1 || condition2;
+                            else
+                                targetAi.LiveProjectile.Add(p, (condition1 || condition2));
                             targetAi.LiveProjectileTick = Session.I.Tick;
                             targetAi.NewProjectileTick = Session.I.Tick;
                             p.Watchers.Add(targetAi);
diff --git a/Data/Scripts/CoreSystems/Session/SessionUpdate.cs b/Data/Scripts/CoreSystems/Session/SessionUpdate.cs
index 381a9171..831d0092 100644
--- a/Data/Scripts/CoreSystems/Session/SessionUpdate.cs
+++ b/Data/Scripts/CoreSystems/Session/SessionUpdate.cs
@@ -46,10 +46,8 @@ private void AiLoop()
                 if (!ai.ScanInProgress && Tick - ai.TargetsUpdatedTick > 100 && DbTask.IsComplete)
                     ai.RequestDbUpdate();
 
-                if (ai.DeadProjectiles.Count > 0) 
-                {
-                    foreach (var dead in ai.DeadProjectiles)
-                        ai.LiveProjectile.Remove(dead);
+                if (ai.DeadProjectiles.Count > 0) {
+                    for (int i = 0; i < ai.DeadProjectiles.Count; i++) ai.LiveProjectile.Remove(ai.DeadProjectiles[i]);
                     ai.DeadProjectiles.Clear();
                     ai.LiveProjectileTick = Tick;
                 }