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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Huge Muzzle Velocity spreads
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<blockquote data-quote="LouBoyd" data-source="post: 830932" data-attributes="member: 9253"><p>When I shoot though a chronograph I'm also carefully aiming at a target at a distance I expect to use the cartridges. For a 7mm RM that could be 500 to 1000 yards. Besides reading the velocity of each shot I also record the point of impact of each shot. That will immediately show if the problem is with the chronograph reading or if the bullet velocity really is variable. It also shows up characteristics of the rifle - cartridge - bullet combination which a chronograph alone does not detect. Loading for low ES & SD is only part of achieving good accuracy. Adding a downrange target insures that loads work well and make sorting out anomalies easier. </p><p></p><p>From the information given I don't know what the problem is. First guess would be the muzzle to first chronograph screen spacing, which wasn't mentioned. The bullet model and distance from the lands wasn't mentioned either.</p></blockquote><p></p>
[QUOTE="LouBoyd, post: 830932, member: 9253"] When I shoot though a chronograph I'm also carefully aiming at a target at a distance I expect to use the cartridges. For a 7mm RM that could be 500 to 1000 yards. Besides reading the velocity of each shot I also record the point of impact of each shot. That will immediately show if the problem is with the chronograph reading or if the bullet velocity really is variable. It also shows up characteristics of the rifle - cartridge - bullet combination which a chronograph alone does not detect. Loading for low ES & SD is only part of achieving good accuracy. Adding a downrange target insures that loads work well and make sorting out anomalies easier. From the information given I don't know what the problem is. First guess would be the muzzle to first chronograph screen spacing, which wasn't mentioned. The bullet model and distance from the lands wasn't mentioned either. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Huge Muzzle Velocity spreads
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