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Originally Posted by Jim243
I thought min distance to the Crony was suppost to be 12 feet?
Jim
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Originally Posted by FrankenMauser
It depends on the brand, model, and (for some) lighting.
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It also depends on some factors with the gun and particular load combination. For instance, if there is a lot of unburned powder when the bullet reaches the end of the barrel, or just uber-powerful magnums cartridges, then there could be substantial muzzle blast, which could cause erratic and just plain wrong readings if the chrony is too close. Also, there is the issue of muzzle blast acceleration, which is caused by the bullet "uncorking" the barrel and the now rapidly expanding gases actually accelerating the bullet beyond "true" muzzle velocity. I've been told that it takes about 25 for the bullet to lose the additional velocity and return to true muzzle velocity. Certainly, this effect only matters under certain load development conditions but it is there, nonetheless.