setting my scope at 100 yards
- Thread starter shaunharkin
- Start date
Very classy guys. You know-it-all's could lighten up a bit. Shaun's a nice guy, kind of new to the precision game, and lives in Ireland. I'm sure you would all fit right in on a Gaelic website. That last part was sarcasm. This isn't. Téigh trasna ort féin
From your eye to the target.
It matters, but only if you are checking a scopes actual click value. Like i said earlier, if everything else isnt near perfect it could all be a wash. The manufacturers use a comparator for testing this and for good reason.
4xforfun said:
It doesnt compute like that. Its a one percent error in distance but it compiles over every moa over which the scope is measured. If it is checked over 100 moa the error is stacked. Same thing about the other possible errors i mentioned in my earlier post. If you unknowingly stack them up against yourself you can create problems that would of just been lost in the noise.
If you are trying to get every last thing perfect for very accurate firing solutions at very far distances it begins to come into play. There are some people who care enough about it to measure it. Thats why the correction factors are in the programs and thats why the manufacturers try so hard to get their scopes perfect.
If you ever get an optic that tracks consistently but not a true moa you may find it useful.
4xforfun said:
By using your argument, why weigh powder to the .01 of a grain, why check case capacity, why measure every bullet for weight and .0001 BTO.
I amazes me the lengths people on this site go to perfect cartridges, yet make jokes or belittle people for measuring for their 100yd zero.. I suppose you don't check the tracking on your scopes here either? But I guess when your competition are 20 shots for score at 1000k yards, you can just waste rounds walking your shots in.
4xforfun
Gold $$ Contributor
Boxcar77 said:
First of all, I made no jokes and belittled no one, so lets put that sh*t to bed right now.
Second...I stated fact. One yard difference in distance measuring at 100 yards makes a difference of .01 inch on target at 100 yards....nobody and no equipment is that good. Don't believe me.....punch the numbers into any balistic program and see for your self. You want to test...let me know how that works out for you.
Third..... my 1000 yard record speaks for itself. What is yours??
Tod
A long time ago, when my shooting and reloading program was about as basic as it could be, a fellow took the time to explain what benchrest was all about, including some of the finer points relating to accuracy. One of my questions to him was how to weight the various factors as to their relative importance. I think what we have here is a prime example of someone focusing on something that is easy to measure that is not going to make any practical difference. This is actually pretty common. Shooters concentrate on what is easiest to measure and neglect things that are less obvious, but which may be a lot more important to their success. I am not saying that this is the case with the OP because I do not have any information about the totality of his shooting program, but I can say that this detail seems to be way down the list near the bottom, in terms of its relative importance.
I have given this some thought , in the past few days. Many have said that the point to start measuring from is the center of the erector tube of the scope. I am not sure that is right. If the objective is perfection in a ballistics calc program the bullet doesn't start to fly till it leaves the barrel. Inside the barrel is internal ballistics and after it leaves the barrel its external ballistics. I am sure this hasn't been lost on the mathematicians that create these programs. That said for this to have any impact at all, the rest of the data that is required would also have to be next to perfect also. You all know what's required, humidity. temp. sea level elevation. distance from center of bore to center of scope, BC ( some thing that we are all lied to about ) muzzle velocity, ect,ect. Has the OP taken all the error out these values also? I was rude with my last post please for give me.
The point is verification of the scopes tracking, which in turn is used for verification of trajectory. Its not for fine tuning of a 100 yd zero.
External ballistics are not affected to any discernable about within +\- 1 yard.
A scopes calibration is because that given amout of movement is so extremely small, and it is then stacked over the entire travel of the erector tube.
If the scopes erector tube travels .0005 instead of .00045 for a click and it takes 120 clicks for a 1000yd correction that 50 millionths error has now become .006". This is called tolerance stacking.
If you know anyone who builds or maintains optics, ask them how the erection screw is made, just use the restroom first.
External ballistics are not affected to any discernable about within +\- 1 yard.
A scopes calibration is because that given amout of movement is so extremely small, and it is then stacked over the entire travel of the erector tube.
If the scopes erector tube travels .0005 instead of .00045 for a click and it takes 120 clicks for a 1000yd correction that 50 millionths error has now become .006". This is called tolerance stacking.
If you know anyone who builds or maintains optics, ask them how the erection screw is made, just use the restroom first.
I brought it up about two pages back stating it as the only reason requiring as precise of measurement as the op questioned.
He also stated nothing about zeroing a rifle and load, everyone infered thats what he meant.
He also stated nothing about zeroing a rifle and load, everyone infered thats what he meant.
In my world, paper punching is a means to an end. That "end" is connecting with rodents at long range. My measurement origin point is from my chair because that's the distance my range finder is reading from (aka: that's where I'm sitting). Doubtless there are a hundred reasons this practice is flame-worthy but it's how I do it.
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