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Max Online: 16728 @ 03/25/12 08:51 AM
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#6365589 - 07/11/16 12:30 PM Parallax - while shooting this morning
603Country Online   content
Extreme Tracker

Registered: 07/03/12
Posts: 4874
Loc: Central Texas
I was blasting away with my 223, which is a real good shooter, this morning. Groups weren't as good as usual and were mostly horizontal. I took that to mean 'user error', so I went back into the air conditioning to ponder on the problem. What I finally decided was that it was me (a terrible thought) or maybe it could be a parallax issue (easier for me to live with). Walked back out to the bench and had a look at the crosshairs while moving my head around a bit. Hmmm, mucho crosshairs movement. I adjusted the scope AO till the crosshairs quit moving, which had the scope AO set on infinity. Well, I can live with that. Groups tightened right up.

The scope is an old Leupold VariX III from the early 90's, but was refurbed by Leupold a year or so ago.

Got more shooting and reloading to do today, so I'll see how it goes.

I checked a few other scopes, and they seem fine.

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#6365635 - 07/11/16 01:09 PM Re: Parallax - while shooting this morning [Re: 603Country]
ChadTRG42 Online   happy
THF Trophy Hunter

Registered: 09/16/09
Posts: 9425
Loc: Lewisville, TX
Yes, I've had several customer rifles brought to me that had parallax issues like this. Generally speaking, the higher the magnification, the more noticeable parallax becomes.

To combat the parallax problem, I move my head back (for more eye relief) on the stock to where the scope sight picture begins to tunnel to a smaller sight picture. I will center up the smaller tunneled sight picture in the center of the cross hairs. This allows your head, or eye, to maintain the same location each shot. It's a band aid fix, and doesn't solve the issue. It just allows you to minimize any parallax issue.
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#6365873 - 07/11/16 04:08 PM Re: Parallax - while shooting this morning [Re: 603Country]
RiverRider Online   content
THF Trophy Hunter

Registered: 11/11/07
Posts: 6220
Loc: Wise Co.
I do the same thing when using a non-AO scope. I think it's a pretty effective technique.
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Originally Posted By: Cleric
God I am hating caliber threads more and more

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#6367446 - 07/12/16 08:42 PM Re: Parallax - while shooting this morning [Re: 603Country]
FiremanJG Offline
THF Celebrity

Registered: 12/16/08
Posts: 17893
Loc: Wolfe City, TX
Good that you figured it out!
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#6369080 - 07/14/16 12:32 PM Re: Parallax - while shooting this morning [Re: 603Country]
603Country Online   content
Extreme Tracker

Registered: 07/03/12
Posts: 4874
Loc: Central Texas
I tried what Chad and RiverRider suggested. Worked nicely, and so I decided to test whether or not my chosen H335/40 gr BT load was really the best possible load for my rifle. I had a lot of reloading of 223 to do, so now was a good time to decide if that load was the best or not. I found a better load, or call it a better node, with a higher powder charge. Put 4 in a ragged hole and put the "dreaded 5th shot" a 1/4 inch out. I hate that. It was me, not the rifle. I knew it when I pulled the trigger. Maybe I should see a Shrink about that 5th shot.

Anyway, the new load prints exactly where the old load did. Surprising, but pleasing. I do think that the reduction in parallax error is what allowed me to find that new load so easily.

And, just to mention it, I finally had to clean the barrel prior to the load work ups. Major amount of carbon fouling, but practically no copper fouling. After cleaning, groups shrank noticeably, even before I found the new best load. Probably had 100 rounds or so through it since it was cleaned last, though I don't count rounds fired.


Edited by 603Country (07/14/16 12:36 PM)

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#6369668 - 07/14/16 08:50 PM Re: Parallax - while shooting this morning [Re: 603Country]
RiverRider Online   content
THF Trophy Hunter

Registered: 11/11/07
Posts: 6220
Loc: Wise Co.
Originally Posted By: 603Country
I knew it when I pulled the trigger. Maybe I should see a Shrink about that 5th shot.




rofl rofl rofl rofl rofl

I'll be sitting next to you in the waiting room!
_________________________


Originally Posted By: Cleric
God I am hating caliber threads more and more

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#6369673 - 07/14/16 08:55 PM Re: Parallax - while shooting this morning [Re: RiverRider]
FiremanJG Offline
THF Celebrity

Registered: 12/16/08
Posts: 17893
Loc: Wolfe City, TX
Achieving group shooter peace is overcoming the fifth shot self psych-out.
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