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Thanks Guys, I put a lot of work and time into designing those charts, as well as attempting to explain how to use them. I may have slightly failed with some of the explanation part because the comments I've seen over the last few years aren't quite how I envisioned them being best used, and...

The test targets I use in my ballistic tunnel are printed on 110 lb card stock and taped tightly to smooth cardboard backers. When I fire shots into this medium, they produce holes (as defined by the grease or grit ring) that are consistently 0.215” in diameter. If 5 of my shots were to go thru...

Can I ask how you came up with a 0.125 BC? In my live fire testing in my ballistic tunnel, nearly all of my data was acquired with true match ammo (Center-X/Midas/X-Act, as well as Eley Match/Tenex). My calculated G1 BC was almost equal to what you said had to be input into the Kestral to true...

If you think about it logically, any aerodynamic forces that cause a projectile to fly to the target with excess longitudinal and lateral movement around its axes will cause an increase in drag coefficients and change both G1/G7 ballistic coefficients for the worse. Think yawing, coning...

2500X with Shilen Ratchet at 50 yds in my ballistic tunnel. I was testing 4 lots of the latest shipment of Tenex from KSS. Three lots failed, but this lot passed. Landy

“On pages 169,170 Vaughn says the resultant dispersion is equal to tangential velocity times time of flight. That makes Cg offset a linear contributor to dispersion.” If I understand you correctly, that’s true. However, I’m nearly certain it will cause a non-linear growth in dispersion as the...

The equation in the linked thread was originally developed by Harold Vaughn in his book "Rifle Accuracy Facts". By indexing, I'm talking about taking where the bullet was drilled to impart the imbalance, and then indexing it in the chamber as if you were looking at a clockface. Landy

This is not "BULLSHIT BENCHREST" and my charts are accurate. They may not be able to manage the offset of a hair's diameter like you said, but they're adequate enough to manage under 0.1" if you're lucky and/or skilled enough to have a RFBR rifle at or above the 80th percentile. Practical...

Thanks Ken, Coming from someone with your resumé in the shooting sports means a lot to me and I really appreciate it! Landy

Yes, you can say that. After all, it was the whole point of my previous post. BTW, the oft quoted words attributed to Samuel Clemens in your meme aren't his, but he did use them in his autobiography. They were used by Benjamin Disraeli as stated by Clemens and a quick search revealed they may...

Statistics NEVER lie! Not once in the entire history of this area of science have they ever lied. Even on those rare occasions it might seem like they lie, peer review by fellow scientists quickly reveals a mistake and it's rectified. It's too bad there isn't any peer review for politicians...

After waiting for what seems like forever, I finally found some new Lapua to test. Of the 8 lots total I received, there were 3 lots of Center X. In my Phase 1 testing of the first 4 lots I tried there was just 1 lot of Center X and it produced the groups as well as the Virtual Composite of all...

No hard data and only observation/opinion, but killer lots of both Eley/Lapua don't seem to have any statistical correlation to chamber design in my experience, and many or maybe the majority of the guys who are most successful these days in RFBR have all manner of chamber dimensions and shoot...

Considering what you're trying to accomplish and the conditions you're shooting in, it's probably not necessary to record the x-axis SD. However, since it's so easy to calculate/record, and you never know when it might be valuable in the future, a dataholic like me records and tracks some 50...

Correct me if I'm wrong, but it appears you're plotting the shots and using the x,y point data? And, then calculating the Standard Deviation from the y-axis coordinates? If so, there's another statistical metric that may be useful for you called the "Statistical Slope" if you use a chronograph...

The scoring on the ARA target is worst edge with the 100 ring being 0.500" and there are no X's. The IBS target is best edge with the 10 ring being 0.500" and the dot needs to be touched by a 0.224" plug to be an X. I'm sending you an email to keep statistics to a minimum considering the...

Yeah, there's a huge difference between IBS/IR50/ARA targets and others. You can net an IBS 250 if the 25-shot distribution centered on the target is 0.724" or less. An IR 250 if it's 0.474" or less. But, an ARA 2500 requires 0.276"! ARA 2500's are very hard to do! Landy

I think you're doing just fine, and if your barrel is a good one, it becomes primarily a matter of finding the right ammo and a lot of work in mastering the wind. I've been shooting competitively for 40 years now in several shooting disciplines and I still find myself experimenting with...

Because the target images provided by 4Certain were of sufficient resolution that I'd have very small uncertainties in my measurements (+/- 0.005"), I thought it might be interesting to plot the shots and input that point data into OnTarget TDS so as to see how they compare to the much more...

In my humble opinion, but based on my study of metrology at the current time, this device from KSS in conjunction with a 0.224" scoring plug, provides the best option and it's what we used this year at the ARA Nationals for protests. It's nearly the same as Ken's method, but this magnifier has...