So, many a shooter has followed this theory and has been satisfied with the results. Along comes a naysayer who wants mathematical proof. Who cares. He may have simply made some experiments and found it worked for him. He might never have even tried to prove in other than makin a hundred different experiments.
Bottom line is if it works for you then use it. If you can't make it work then don't.
I don't blame him for not answering a lot of what I call smart-ass questions. People who want to play "Gotcha" need to get a life.
I use the "Chris Long spreadsheet" and "QuickLOAD" to identify possible nodes. What I have found that its not perfect but very close.. In researching the theory I have found numerous references to the speed of sound in various materials. Most charts show Stainless is about 4% slower than 1% carbon steel.
Most Barrels are some variation of 41XX chromoly or 416 Stainless Steel. I finally had and epiphany with two near identical Remington 700's chambered in 300 RUM.
The Carbon steel barrel: 212 ELDX, 99.6 grains of LRT 3000 FPS with a calculated barrel exit time of 1.325 milliseconds, .5 MOA at 200 Yds
The Stainless steel barrel: 212 ELDX, 97.5 grains of LRT 2926 FPS with a calculated barrel exit time of 1.372 milliseconds, .5 MOA at 200 Yds
Swap the ammo between rifles and you will be lucky to shoot a 2 MOA.
I have 4 .308 Winchesters one Steel and three Stainless steel. I applied my 4% (Barrel exit time) theory and its scarry close.
If you need something to keep you awake at night watch this:
My quest is to build an instrument (
Arduino based) and test the barrel when it comes off the lathe threaded and chambered.
What is the speed of sound in that barrel at 30, 60 and 90 degrees F.
To Chris Long, its much harder to break trail. Thanks for having the courage to bring attention to this concept.
Tim Shamblin
40 years reloading.
