Help zero
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All Springer/NP/PCP Air Gun Discussion General
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Optics, Range estimation & related subjects
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Tpatner412
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Help zero
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Topic: Help zero (Read 628 times))
TxFlyFish
Shooter
Posts: 35
yes
Real Name: Beika
Help zero
«
on:
March 13, 2017, 08:54:51 PM »
768fps, jsb 8.44, 2inch scope height. I zeroed at 20yd, expecting the pellet to maintain elevation at 30yd. Instead it's dropping at 1 inch below POI. Tried ChairGun and Ballistic AE. It almost seems like my 20yd zero the bullet is dropping (far zero) instead of rising (near zero). I want the trajectory to rise at 20yd zero.
I can simulate the actual trajectory by changing scope height from 2 to 0.5. Is my barrel bent? So confused
The scope mount is solid and the rifle groups awesome.
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Austin, TX
Roadworthy
Honorary GTA Moderator
GTA Senior Contributor
Posts: 9706
yes
Real Name: Thomas
Re: Help zero
«
Reply #1 on:
March 13, 2017, 10:14:59 PM »
Download a copy of Chairgun Pro free from the Hawke Optics website. It will give a graphic interpretation of what's going on.
http://www.hawkeoptics.com/chairgun.html
Also try zeroing at thirty yards.
«
Last Edit: March 13, 2017, 10:17:23 PM by Roadworthy
»
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Near the Southern Coast of Washington State
Real knowledge is knowing the extent of one's ignorance.
TxFlyFish
Shooter
Posts: 35
yes
Real Name: Beika
Re: Help zero
«
Reply #2 on:
March 13, 2017, 10:48:37 PM »
Thank you will do! I played a bit with iPhone app and I'm wondering if it's a bug. At 20yd it's a near zero and 30 yd it interprets as a far zero
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Austin, TX
jentry
Marksman
Posts: 306
yes
Real Name: Jentry
Re: Help zero
«
Reply #3 on:
March 13, 2017, 10:58:14 PM »
My Android based app only has an option to specify Far Zero, and near zero is calculated as a default. Does yours ask/show something different?
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DFW, TX
HW97KT .22
HW50S .177
TX200 .177
Roadworthy
Honorary GTA Moderator
GTA Senior Contributor
Posts: 9706
yes
Real Name: Thomas
Re: Help zero
«
Reply #4 on:
March 13, 2017, 11:47:56 PM »
I plugged your numbers into my Chairgun Pro. The low point will be your point of firing. The pellet will rise about two inches until it reaches the zero point at twenty yards. It will continue to rise until hitting its zenith at about twenty five yards. At twenty eight yards it will cross the second zero and by thirty yards it should be a quarter inch low.
From my experience I can say these numbers approximate my results. Your results tell me your velocity is lower than stated.
If your zero is twenty yards to get a drop of two inches by thirty yards would take an initial velocity of about 450 fps.
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Near the Southern Coast of Washington State
Real knowledge is knowing the extent of one's ignorance.
TxFlyFish
Shooter
Posts: 35
yes
Real Name: Beika
Re: Help zero
«
Reply #5 on:
March 14, 2017, 08:41:57 PM »
Thank you guys so much for the help! It ended up that chairgun was switching between near zero and far zero automatically somewhere between 20-25 yards. It's finally shooting right!!
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Austin, TX
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GTA
»
All Springer/NP/PCP Air Gun Discussion General
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Optics, Range estimation & related subjects
(Moderators:
Tpatner412
,
only1harry
,
GTA-Airgunner
) »
Help zero