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Posted: 11/12/2003 9:42:29 PM EDT
Sighted in my new ML2 several weeks ago. Its on a ARMS #45 with ARMS aimpoint mount. Got it all dialed in at 50 yards (1/2 inch groups). Last week took my AR to the range again and I was low and left by 1.5 inches at 50yrds. The only variables changed were temperature (much colder), same ammo. There is no noticable movement in my mounts and everything seems to be attached solidly. My AR rides in a nice hard case and I didn't clean it from the first to second range session. Is this normal?
Link Posted: 11/12/2003 10:58:56 PM EDT
Yes, this is normal. Changes in temperature can affect both the rifle and the bullet trajectory. With colder temperatures, the air will be denser and should cause more drag on the bullet which will cause the bullet to drop a little. Also, with the colder temperatures the barrel and other parts of the rifle will be affected because the metal will contract. Did the point of impact change as the rifle heated up?
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