Free: Contests & Raffles.
First range day I zeroed at 200 yards. Then I shot small steel targets from 300-550 yards all day long. Second range day I had to make some minor adjustments but was at least still on paper at 200 yards.
Quote from: CaNINE on October 07, 2015, 11:41:51 AMQuote from: jaymark6655 on October 07, 2015, 11:29:41 AMtemperature difference and a really sensitive powder? Maybe the swing in chamber pressure is causing the bullet to leave the muzzle at a different point in its vibration or recoil?Pressure changes with altitude, but temperature and humidity also change it so an increase in altitude of 3000 physical feet might be effectively a lot more if you sight in at sea level on a really cold day with no humidity and then climbed 3000 feet higher and shot on a really hot, humid day. I can't imagine any change in weather that would cause that much of a shift though. What powder are you using? If you're not using a temp stable powder you could see that much shift. What were the environmental conditions when you zeroed verses where you are shooting now?Not a chance. If this is true,rifles would make better clubs.
Quote from: jaymark6655 on October 07, 2015, 11:29:41 AMtemperature difference and a really sensitive powder? Maybe the swing in chamber pressure is causing the bullet to leave the muzzle at a different point in its vibration or recoil?Pressure changes with altitude, but temperature and humidity also change it so an increase in altitude of 3000 physical feet might be effectively a lot more if you sight in at sea level on a really cold day with no humidity and then climbed 3000 feet higher and shot on a really hot, humid day. I can't imagine any change in weather that would cause that much of a shift though. What powder are you using? If you're not using a temp stable powder you could see that much shift. What were the environmental conditions when you zeroed verses where you are shooting now?
temperature difference and a really sensitive powder? Maybe the swing in chamber pressure is causing the bullet to leave the muzzle at a different point in its vibration or recoil?Pressure changes with altitude, but temperature and humidity also change it so an increase in altitude of 3000 physical feet might be effectively a lot more if you sight in at sea level on a really cold day with no humidity and then climbed 3000 feet higher and shot on a really hot, humid day. I can't imagine any change in weather that would cause that much of a shift though.
My guess is the scope got bumped in transit. A 6 MOA shift is enormous and I cannot envision any environmental factors that would cause it.
Quote from: Bob33 on October 07, 2015, 12:05:55 PMMy guess is the scope got bumped in transit. A 6 MOA shift is enormous and I cannot envision any environmental factors that would cause it.It was in a soft case and got buried under other crap for the long, LONG drive, and also shifted around a few times
As a standard practice, I always (try to, at least) fire a test group after travelling to ensure the POI has not shifted. Hit Shappens.
Probably first guess too. Next might be a change in the stock or bind. How is the rifle bedded/floated? Is the stock wood?
Well, you know BC that a few members on here do believe you may have a loose screw.
