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November 28 102yd attempt

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customcutter:
The wind was calm this AM, so I decided to try shooting at 102yds again.  By the time I aired up the gun to 210bar, jumped in the truck, and got everything set up at the chicken barn, it was blowing 5-8mph (just a guess).  It would die down for a few seconds and be blowing again.  It was from the west this AM, so I was hoping with a tail wind it wouldn't have much effect on results.  I got a bigger card board box, and put 4 targets on it.  But still walked down between targets to check the grouping.  First group wasn't terrible, but I realized that the scope was 1/10mil adjustments instead of 1/4" adjustments.  (The other day I was actully making what I though were 1/4" adjustments. :o)  So after the first target I adjusted for 1/10mil (1 centimeter).  Here is the set-up and first target.  After this group I adjusted 1 click right and 2 clicks up.

customcutter:
I'm not sure why some of the pics are turned 90* and some are straight. :o

Anyway, after adjusting 1 click right and 2 clicks up I shot this group.  I waited for the wind to die down between shots if needed.  When I got down to the target and was looking at it, I couldn't figure out the low shot.  It had me scratching my head.  I had heard that a tail wind can cause drop, and a head wind can cause impacts above the POA. 

When I got back to the table, and looked through the scope I had my answer.  Instead of zeroing the crosshair at 100, I have been holding over a slash mark and then placing the first dot on the bullseye.  I think I actually put the first slash mark on the bullseye, and the dot was where the POI occurred! :o  A slight mental lapse to say the least.

customcutter:
The last 2 targets showed promise of what the gun can do, but the wind was getting worse and I think some mental fatigue as well.  After I shot them I shot 5 shots of each of the NSA's that I have also.  None of the NSA's showed much promise so didn't include the targets.  Here's the last 2 targets with the H&N .218 21 grs at 1000fps.

rsterne:
Shooting in a head or tail wind is actually harder than a crosswind, because a slight shift in the wind from 11 to 1 o'clock, or 5 to 6 o'clock, will cause a vertical shift as well as a sideways one.... Not only that, but pellets rise or fall opposite to slugs....

https://hardairmagazine.com/ham-columns/vertical-deflection-for-pellets-in-crosswind/

Bob

customcutter:

--- Quote from: rsterne on November 28, 2022, 05:48:03 PM ---Shooting in a head or tail wind is actually harder than a crosswind, because a slight shift in the wind from 11 to 1 o'clock, or 5 to 6 o'clock, will cause a vertical shift as well as a sideways one.... Not only that, but pellets rise or fall opposite to slugs....

https://hardairmagazine.com/ham-columns/vertical-deflection-for-pellets-in-crosswind/

Bob

--- End quote ---

Thanks for the link Bob!  I had seen the diagrams for pellets before but did not realize it would be the opposite "jump" for slugs.  Definitely good information.  Wish I had held for the correct mil-dot on the low shot for the one group. :o ;D

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