GTA
Target Shooting Matches, Discussion & Events => The Long Range Club => Topic started by: customcutter on November 28, 2022, 02:08:27 PM
-
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.
-
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.
-
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.
-
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
-
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
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
-
I did some more shooting yesterday after adding the 1" Monstrum riser, and moving the scope back a little. Much more comfortable. I had used up the first tin of H&N .218 21 gr slugs, and when I tried the other tin they appeared oxidized. I didn't have the Ballistol with me so I tried shooting some several days ago and they were terrible.
Yesterday I added a little Ballistol to the NSA .217 23gr slugs and also the oxidized tin of H&N's. I decided to zero in at 100yds due to the error in post #2 of this thread instead of trying to hold over. It would print 2-3 sub MOA and 1-2 fliers that would open up to 2-2.5MOA. I tried several targets and couldn't get any better results. Finally I posted up a ShootNC target and was going to walk the target back to check hold unders every 10yds for the 23gr NSA's. Then I got the bright idea that I wanted to check the difference between the 23gr NSA's and the 21gr H&N's. It was one MIL dot plus 1/2" on 14 power on the scope, and all 3 rounds were sub 1MOA. So I decided to rotate the target and try NUAH again with the .21gr H&N .218's.
I aimed at the bottom of the 1" black ring and yes first shot I forgot to hold under 1 MIL dot. ??? The other four shots were in the 10 ring. :o The other 3 targets had 3 in the 10 ring and a couple of fliers. Maybe one day I will get both brain cells functioning on the same page. LOL
-
Almost there brain cells! Watching and cheering you on!
-
Ken, Great shooting!
-
Ken, Great shooting!
Thanks Zack. I was surprised, just shooting the gun as I received it. The previous owner had tuned it to shoot JSB RD's but went with the BRK Ghost instead. I'm glad he did! ;D