Joe

It's easy to get it wrong particulary at a match. I had the same problem with Weaver "T"s which don't have a range index.  My STS has a distance mark for paralax but still I keep records in the same fashion. One of my friends got me doing it like this.

I read them like a micrometer writing the index marks in my range book.

When logging Paralax adjustment I write "4/7"   The four is the fully visiable number on the barrel of the scope. the 7 is on the rotating bell

For elevations and windage Sometimes I will add another index number like "2/10+2"  That means 2 on the fixed barrel of the knob.  10 on the rotating knob itself and + 2 means two index marks past the 10. I never log - always +

The only time I use clicks is when actualy shooting and feel like I need to put a minute or two on elavation or windage without looking at the knobs. And after shooting I record the change I have put on the scope. That way I can go back to zero for the particular target if the wind shifts.

I also don't trust the range index for fine paralax adjustment. It's close but not exact and find most scopes I use are set off  slightly from the indicated ranges

Key to all of this is always using the first fully visable index mark on the fixed part of the scope. And keeping a good record book

Boats

I know it's a micrometer, Bob. I have notebooks that show that I've made one-revolution errors a number of times in the past with STS scopes.
What brought the subject up is the powder measure test I'm currently working on. I've got micrometer powder measures from RCBS, Hornady and Redding, on loan, for the test. Each measure takes about a full day to test. During the re-setting part of the test on the RCBS Competition measure I made two different one-revolution errors setting the measure. That brought to mind the STS problems. I looked at the RCBS measure micrometer for a long time, fiddled with it. I can't exactly explain the problem but it has to do with 1. the fixed scale ain't linear = the fixed mark at zero ain't where the fixed mark is at ?120? for example, and 2. there's a big difference between the barrel OD and the thimble ID means that it reads different depending on what angle you're looking from.
The Redding and Hornady measures have micrometers that look more like those on micrometer calipers.
I don't know why the STS problems, I've yet to look at one closely to see if I can figure out WHY it happens, but there's no question that for me it DOES happen.
However, I seem to be the only one.
(BTW, look in the book for great explanations of STS and Iron sight inc. vernier adjustments.)
Hope you're feeling better.
joe b.

The question is simple. Has anyone had the experience of reading the setting of a Lyman STS scope incorrectly by one revolution? That's the question. 
I have. Not during a match. Not with any pressure on me. Not because I didn't want to record the settings correctly.
Boats comments regarding the parallax setting are right on. I looked at a scope at the range today, and see the same distance between the moving and stationary members, allowing different conclusions after looking at the scope.
We're not talking about pilot error here, we're talking about micrometers that do not have the characteristics of proper measuring instruments.
I'm all set on advice, looking for DATA, FACTS. 
Maybe I'm the only person inb the world who ever made this kind of error. But if not, I'd like to hear about it.
Thanks;
joe b.

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If you don't have a STS, you haven't had the experience.
If you haven't examined a STS in the context of the explanation above, you can't understand the explanation or the difference in characteristics.
If you have an RCBS Competition measure you could understand the explanation and the question.
Without one or the other you have nothing to bring to the table to help me except opinion unfettered by knowledge of the situation.
I'm beginning to suspect that this is the wrong question to ask of the wrong people, it seems that mistakes are made very infrequently here.
JD, borrow a STS, spend some time with it, then talk to me.
joe b.

Borrow one, Joe. You'll enter the realm of data, leave the morass of opinion. Will somebody lend Joe a STS? Where are you? Maybe I could lend you one.
joe b.

Quote:



and also just BTW in several side-by-side comparisons over the years, in my experience Unertls have proven clearly (pun intended) superior to the Lymans. Guess I wuz just lucky that I never encountered the dreaded 'Super Target Spot Thread Strip' or whatever it is. Or maybe I'm lucky I never got anything caught under my adjustment bearing points when returning the scopes to battery...............?
Heh Heh, Joe