muzzle velocity

[grampagord]

I have a cronograph and want to know how to figure out muzzle velocity if you measure speed 10 feet away. Gord

 

[H4831]

I have a cronograph and want to know how to figure out muzzle velocity if you measure speed 10 feet away. Gord

There is such a little difference, that it is usually just ignored, and 10 feet away is considered muzzle velocity.

 

[grampagord]

Thanks. Knowing that ican figure out Energy at muzzle.

 

[scout]

IIRC, it's something along the lines of 2 fps difference per yard.

 

[Grinch]

MV can be anywhere between 7-10 fps added to the indicated speed at the chronograph. Very little difference but you can fool with your ballistic tables by adding this amount.

 

[Kelly Timoffee]

Too close with a chronograph and your muzzle blast will be giving you grief.

10-15ft away is where it is typically measured anyways.

 

[grampagord]

125 gr 357 mag are movin 2000 ft/s with 17.6 gr 2400
140 gr XTP 17.6 gr 2400 2050 ft/s

 

[HKMark23]

Whatever the difference is, it falls within the "margin of error" capabilities of your chronograph. Ergo, by making an adjustment you can be decreasing the error or increasing it. Have fun.

 

[grampagord]

tried the crony with the tc pro hunter 50 cal
240gr xtp in a sabot 150 gr pellet of Jijm Shockey powder movin at 2000 ft/sec.
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