Ladder testing using 300 yd velocities?

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ihmsakiwi
Posts: 21
Joined: Sat Mar 02, 2019 5:53 pm

Ladder testing using 300 yd velocities?

#1 Postby ihmsakiwi » Sat Jun 15, 2019 5:09 pm

Hello,

I have searched for the answer but unable to find it.

Question; I assume you can use the recorded velocities from the electronic 300yd range targets for ladder testing or does it need to be muzzle velocity? Peter

AlanF
Posts: 7495
Joined: Wed Jun 15, 2005 8:22 pm
Location: Maffra, Vic

Re: Ladder testing using 300 yd velocities?

#2 Postby AlanF » Sat Jun 15, 2019 6:39 pm

If you're referring to the velocities from Silver Mountain or Ozscore targets, I seem to remember reading that the velocity figures are not guaranteed to be accurate enough for normal chronographing purposes. For ladder testing you don't necessarily need velocity data, but if you do use it, it needs to be decently accurate to be of value.

ihmsakiwi
Posts: 21
Joined: Sat Mar 02, 2019 5:53 pm

Re: Ladder testing using 300 yd velocities?

#3 Postby ihmsakiwi » Sat Jun 15, 2019 7:03 pm

Thanks AlanF.
Yes, Silver Mountain information. Thanks for the reply.

Triplejim
Posts: 598
Joined: Mon Nov 14, 2005 12:48 pm

Ladder testing using 300 yd velocities?

#4 Postby Triplejim » Sun Jun 16, 2019 10:08 am

Ozscore works on time of flight, Silver Mountain calculates a terminal velocity

AlanF
Posts: 7495
Joined: Wed Jun 15, 2005 8:22 pm
Location: Maffra, Vic

Re: Ladder testing using 300 yd velocities?

#5 Postby AlanF » Sun Jun 16, 2019 10:34 am

Triplejim wrote:Ozscore works on time of flight, Silver Mountain calculates a terminal velocity

So if time of flight on the Ozscore is sufficiently accurate, it could be used instead of velocity for ladder testing purposes. You could graph it against charge weight and vertical POI in the same way as velocity. Velocities should preferably be accurate to about 0.1%, so the same requirement would apply to time of flight.

Triplejim
Posts: 598
Joined: Mon Nov 14, 2005 12:48 pm

Ladder testing using 300 yd velocities?

#6 Postby Triplejim » Sun Jun 16, 2019 10:56 am

Yes, GR says many shooters using his targets are tuning their loads using ToF data
Concept is the same, reduce ES.


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