Missile Projectile Bug

[AmplSi]

So I am making a custom weapons mod. In it, I created an automatic gun which shoots miniature missiles. I created the projectile within the G.E.C.K. by using the data from a normal missile, applying the custom .nif and changing the explosion (first to the zhu rong fire burst, then to the powder charge explosion). I then applied the projectile to the gun, saved, then went into FNV to test it. Once in Fallout, I realized that the only way to do damage was to either get the explosion in the correct place (could only harm myself by shooting at my feet) or going into VATS. In order to fix it, I had to enable the Hitscan option in the projectile data. However, when tested, it caused the missiles to become invisible due to extreme increased speed (which i did not increase in the projectile data; I tried decreasing it, no changes.) and the explosion would not stop. The explosion would start where the projectile hit, but would then get stuck on a loop. I would greatly appreciate it if someone could help me figure out this bug.