Your rifle & scope are fine. Its your light. Brinkmann Q-Beam Blue Max Marine 12V Spotlight
For $200 or less I'd look at a Streamlight or Surefire Rail mounted light. They are built for a lifetime of use. I know our State Highway Patrol has them mounted on their AR's, they are amazingly bright. For around $500 the digital night scopes are very capable out to 150 yards or so with the built in illuminator.
Weapon Mounted Light & Flashlight Products | Streamlight
SureFire WeaponLights
...I've researched IR scopes but they seem to have short range....UNLESS...you add an IR "Illuminator"....???? waz that...an IR flashlight?The cost can really add up fast..... If I just used a really bright white light the critters will take off....no shot. Ideas?