Free: Contests & Raffles.
my bet is a loose base screw
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.It happens. I've had well over 6 MOA in variation with Reloader 33 in my RUM. If you zero at 80 degrees at sea level then hunt at 3000 feet at say 40 degrees you may see a significant shift depending on the powder used. This is why temp stable powders like H1000 and Ramshot Magnum are so popular. I freeze my ammo overnight and then test to see if my zero will shift. If it does the load is no good. 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.It happens. I've had well over 6 MOA in variation with Reloader 33 in my RUM. If you zero at 80 degrees at sea level then hunt at 3000 feet at say 40 degrees you may see a significant shift depending on the powder used. This is why temp stable powders like H1000 and Ramshot Magnum are so popular. I freeze my ammo overnight and then test to see if my zero will shift. If it does the load is no good. 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.
Bean, did you end up getting a new scope for your .270? If yes, what did you go with?
