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labradar info use

I have the labradar , and I do like it . could you guys clue me in to what the down range velocities are used for . I have mine set for 25 , 50 , 75 , 100 yards . other than muzzle velocity readings , I'm lost on the purpose for the down range velocity info . thanks Jim
 
I have the labradar , and I do like it . could you guys clue me in to what the down range velocities are used for . I have mine set for 25 , 50 , 75 , 100 yards . other than muzzle velocity readings , I'm lost on the purpose for the down range velocity info . thanks Jim
Knowledge is everything mode. The Ke ratings means more to me in most scenarios. That good old Kinetic Energy or thumper is what counts. BTW, I have mine set at the exact same distances.
 
I have the labradar , and I do like it . could you guys clue me in to what the down range velocities are used for . I have mine set for 25 , 50 , 75 , 100 yards . other than muzzle velocity readings , I'm lost on the purpose for the down range velocity info . thanks Jim
My understanding is that you can use the information to calculate a BC for the bullet, if you were so inclined.

That may or may not be accurate, but that's what I read 'somewhere'.
 
thanks fellas . I just wasn't sure if I was missing out on using this info in another way . I sure appreciate your replies . Jim
 
been thinking about buying a Labradar but i have a question has anyone used one inside a shooting house and would a 8 inch wide by 12 inches high window hole big enough for the Labradar work ? the window hole the barrel is out is about 16 inches away .will the Labradar work then ? thank you,Pete53
 
been thinking about buying a Labradar but i have a question has anyone used one inside a shooting house and would a 8 inch wide by 12 inches high window hole big enough for the Labradar work ? the window hole the barrel is out is about 16 inches away .will the Labradar work then ? thank you,Pete53
It needs to see the bullet to the target from the muzzle
 
You can calculate BC, as others have said. This is a risky proposition because the range is so short, but it does appear to work very well the times I have done it, and I know some shooters who report similar results. I'm guessing it works better with some bullets than others, but for bullets that match up well with the standard drag functions, it's surprisingly accurate. Berger's heavy bullets tend to match up with the box number very well. Others may as well - I haven't tested many. My own bullets calculated out to .316, and the labradar put them at .317.
 
I've found with most all my Magnum cartridges running heavy bullets I'm besting listed BC values a bit.
I'm calibrated for 30, 55, 70, 85, 100 yards. I had trouble getting consistent readings past that with calibers under 6.5mm. 30 cal has no problems out to 150 yds but don't want to recalibrate the unit for every rifle.
 
You can calculate BC, as others have said. This is a risky proposition because the range is so short, but it does appear to work very well the times I have done it, and I know some shooters who report similar results. I'm guessing it works better with some bullets than others, but for bullets that match up well with the standard drag functions, it's surprisingly accurate. Berger's heavy bullets tend to match up with the box number very well. Others may as well - I haven't tested many. My own bullets calculated out to .316, and the labradar put them at .317.
Do you have a BC calculator on your website?? I'm using JBM currently http://www.jbmballistics.com/cgi-bin/jbmbcv-5.1.cgi
 
been thinking about buying a Labradar but i have a question has anyone used one inside a shooting house and would a 8 inch wide by 12 inches high window hole big enough for the Labradar work ? the window hole the barrel is out is about 16 inches away .will the Labradar work then ? thank you,Pete53

The LabRadar does not need to "see" the bullet from muzzle to target. In fact, Vo is calculated from the downrange velocity measurements, rather than measured directly, which is the primary reason for the various downrange velocity measurements. In a typical setup, the bullets will usually "enter" the radar beam anywhere from a yard or so, to a few yards downrange. It is an incidental benefit that we can also use the velocity decrease over distance data to estimate BCs. In my hands, the BC estimates from JBM using velocity drop data have been quite good as compared to published bullet values considering the relatively short distances involved (i.e. <100 yd).

Pete53 - I would think your primary considerations using the Labradar in such a setup would be the proper aiming of the beam and making sure you had the offset distance set correctly. The unit has a small v-shaped notch across the top center for use as an aiming guide. I found the little notch very difficult to use and therefore glued an ~1.25" x 3/8" steel bushing into the groove with silicone rubber for use as an aiming tube. It is much easier to use. In your setup, you'll nee a way to both aim and adjust it, as well as to manipulate the controls. As long as you can do that through the available hole, the offset, [sound] trigger sensitivity, and aiming of the beam, are all parameters that you should be able to adjust to obtain satisfactory function of the unit.
 
The LabRadar does not need to "see" the bullet from muzzle to target. In fact, Vo is calculated from the downrange velocity measurements, rather than measured directly, which is the primary reason for the various downrange velocity measurements.

Having a hard time parsing your statements. I'll ask my questions one at a time.

How is the Vo calculated "...from downrange velocity measurements, rather than measured directly,..." if those measurements are not taken?

And how does "...which is the primary reason for the downrange velocity measurements." fit in if those measurements are not taken?

No matter how I tear your statements down and re-read them, in order for them to make any sense, there must be measurements taken downrange, which is directly at odds with one of your claims.
 
Having a hard time parsing your statements. I'll ask my questions one at a time.

How is the Vo calculated "...from downrange velocity measurements, rather than measured directly,..." if those measurements are not taken?

And how does "...which is the primary reason for the downrange velocity measurements." fit in if those measurements are not taken?

No matter how I tear your statements down and re-read them, in order for them to make any sense, there must be measurements taken downrange, which is directly at odds with one of your claims.
The LabRadar mathematically extrapolates a muzzle velocity from down range measurements. I dont know thier exact method, but I would guess it uses a few points. It doesn’t need to see it all the way to the target. In fact, it can’t in most cases.

And it doesn’t and can’t make any measurements at all until the bullet is well past the muzzle.
 

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