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Has anyone Chronographed new ammo? I tested some Win AA 1145 and I came up with 1200,1220,1190,1230. None near 1145. Remington Gun clubs 1145 tested at 1160,1130,1160. Interested in why the Win AA tested at or above 1200. I am trying to load up some ammo the same as AA.
 

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The type chrono you used is different from the industry type. Yours clocks leading pellets, theirs the mass. While no absolutes are involved, typically 40-60 ft per second will be noticed.
 

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Also, SAAMI had tolerances on speed. 90 fps +/- speed advertised on the box.
 

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870,

I think that is exactly what saami guide says.

Nominal Mean Velocity +-90fps. 3dram = 1200 fps NMV +-90fps.

A 1200FPS (3 DRAM LOAD) can have any or all shells of 1200+-90fps. Though with controls set in place in reality it is closer to actually 1200 +-35fps. Remember it has to be based on the components used for a tested 1200fps load. A 1200fps load from any manufacture has different components or different amounts of the components in any faster of slower NMV load.

A 1250fps NMV load is not 3dram equivalent. Even if Winchester puts 3dr eq on the box. It is not.


Shoot well.

John



jhunts_2008_030314.jpg

 
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