This is one of those things that sounds simple. More spin more spin drift. Yet Mil turrets make it even more misleading. I.E. 0.1 mil at 1000yd is about 3.6 inches, so 0.2 mil would be 7.2 inches while the actual amount of drift of my 1:11.25 is about 9 inches. While 0.3 mil would be 10.8 inches for his actual 11.7 inches of drift. While 1/4 MOA and 1/8 MOA turrets would allow for more accurate compensation during a competition, the amount of knob turning required for open field work makes mil turrets a bit easier on the fingers. JMHO. When it comes to elevation adjustments, the Old Ten Dot Mil-dot reticle won't cover the mils adjustments from a 100 yard zero to a 1000yd POI, so extended substention reticles are probably beneficial afield. Once again, JMHO.
Since spin drift is going to happen and it's a known value at known distance, by not accounting for it only increases the overall amount of error. Granted 7.2-10.8 inches variations at 1K can be far overshadowed by many other inaccurate variables. But I am under the impression that the math portion of a shooting solutions should be as correct as possible. We all know that Human error far outweighs all other factors. JMHO.
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Range Report - Spin drift that drastic?
Richard references one of the main issue with people sending their optics back is due to spin drift due to the bullet traveling down the rifling. While i could understand the effect, is it that drastic?
Starts at Post #16
I prefer to factor all known variables. If I can prove that the bullet will consistently behave a certain way I add that to my ballistic solution. Regardless of distance in my opinion. The more variables removed through application of known data allows me trust my wind calls and corrections more.
One of the benefits of shooting on a Known Distance Line is that you remove the variables required to determine the correct distance to the target. Shooting at an unknown distance adds another skill set to the equation. JMHO.
Unknown difference is my favorite. But the Horus and Tremor reticles make holds super easy. But that implies that I know the size of the target. Had to burn the Mil relation formula into my mind. It makes known size targets inside of 1500 a simple task.
Unknown difference is my favorite. But the Horus and Tremor reticles make holds super easy. But that implies that I know the size of the target. Had to burn the Mil relation formula into my mind. It makes known size targets inside of 1500 a simple task.
It’s irrelevant and not something that I would be concerned with. If I miss.2 right I don’t come off the line and tell my buddies I had .2 of spin drift. I tell them I had .2 of wind. Same goes on a straight up hit. I wouldn’t say I had.2 of wind left but the spin drift put me back on center. Shooting sub moa groups at a grand isn’t easy. It’s mainly something i hear about on the internet. Conditions usually don’t allow a shooter to call spin drift
Guess I'm getting a bit Old. Made me peruse my Impact Data Sheets. I-SIGNS1. But the MSR allows me to still be accurate enough all by myself. LOL.
When Military shooting at unknown distance 0.2 Mils could be the difference between telling things to your buddies and being carried by them. But that is the entire purpose of training/competing at the KD range. Could be one of the reasons most Mil/Ex-Mil folks are so anal about LOGS. Actual POI Records still are more valid than Ballistic Calculations. JMHO. But giving the competition a 7.2 inch advantage is difficult to overcome during the course of a match. Especially with the wind at your face, which is preferred during any Hunting situation. Yet such an advantage may not be possible at the KD range? Let's see, centered on a ten inch vital area, 7.2 inches right. Sounds like a clean miss to me. Looks like it's time to visit the Finn accuracy MSR video to me. JMHO.
But spin can push a bullet back on target, and spin can drift in the same direction as the wind which can make the wind call very difficult to assess accurately. If I miss, I miss. I call the distance and direction/correction of the miss. I don’t give a reason as to why I missed. I just missed. Maybe it’s just me but if I can prove that something happens with some I prefer to prepare for it. And I would love to shoot with you some time. I frequent Element but also have a membership at Altus. Not being a jerk just want more long guns on the long range.
