Stupid Question Regarding Bullet Stabilization

[KYAggie]

OK, well, I'll admit I didn't have time to read all the way through this thread yet, but I want to chime in anyway with some personal experience. In 2001, I purchased a used Blaser R93 with a 270 Win barrel and a 300 Win Mag barrel. I started the testing with the 300 Win barrel and was at first disappointed that I could not get groups at 100 yards less than 1.25"; most ran 1.25 - 1.5". I gave up and started shooting at 200 yards just for the heck of it and to my surprise, the groups were the same physical size; consistently. I had never seen a rifle that shot 1.5" groups at 100 yards and 1.5" groups at 200 yards as well; I'm not talking about MOA here, I'm talking about physical group size. I was using 180 Swift Scirocco bullets. I found the 270 barrel to perform the same way a few years later when I was using the 140 Nosler Accubond. I have no idea why, I'm not sure what Blaser did to make these guns shoot like that, I'm also not sure if other Blaser owners have seen the same results. All I know, is that of all the guns I own, this one shoots the same physical size groups at 100 yards and 200 yards. I wish I had kept the targets. I haven't shot this rifle much lately, I use to live in Idaho, not much need for a 300 Win mag in KY where I live now, and I'm having too much fun shooting deer with an AR10 these days. But this thread is making me want to drag it out and see if I can replicate the results. Now if it would just warm up a bit and the water would go down so I can actually get to the range.......

 

[AIAW]

In addition: This phenomenon was covered by Litz many years ago in a paper that he release where he coined the behavior "Epicyclic Swerve". I'll attach it for reference.

 

[bax]

The bullets have this "coning motion". I can accept that. The motion is different for bullets and RPMs at launch, I accept that. But I get stuck on this: in order for the 100 yard group to be 1 moa and the 300 yard group to be 0.5 moa, the bullet paths have to make a larger cone then converge to a smaller cone -- or -- the cone defined by the bullets paths does not actually get smaller, it only appears to get smaller. The 100 yard group looks bigger because the holes are not round. I am assuming that the coning motion changes the lift due to crosswind - I don't know, more coning = more lift or something. Assume that there is a line from the muzzle to the center of the target. Wind is right to left. Bullet fired, coning motion generates lift, bullet goes right. Once the bullet is half an inch to the right of the line because of mucho lift, then why would the amount of coning motion change? The bullet is now right of the line. If lift changed why would it drift back to the left? I can only see it happening because there is a force moving it left.