Re: Bullet Stabilization Questions
My take on the matter is that it might have a little to do with BC and velocity. Like most here, I dont know or understand why this might happen. Listed below are 2 examples of bullets that should have been MORE than stable, yet what these 2 examples have in common is their low BC.
I had a load for my 308 win that I dont have anymore. It was a 150 nosler BT at 3100 FPS at the muzzle. It would group ragged 1 holes at 100, and 1.5" at 400 yards. At 600 yards it was 1 MOA or 6 inches at 1k they were sideways. Twist was 12. BC is .435 and it would get worse with velocity decay.
My new 308. Had a 168 grain load at 2600. It would group .25" at 100 and .750 at 300, 1.5 at 400 and 6" at 600 at 1000 they were also sideways. The BC from that bullet in my rifle was .450 Twist was 11.25
Both loads were tested in cold dense air. Both had a poor BC and the one with the highest BC had a lower MV.
Now for the kicker. The 168 grain load was increased to 2661 FPS in the same conditions. It shot .3-.5 MOA at 100 yards. It shot .3-.5 MOA at 600 yards. It shot almost perfectly straight holes at 1k (slightly oblonged) and exactly 1 MOA or 10".
Could it maybe that the velcoity to BC ratio had somthing to do with it?
I also have lower velocity loads with very high BC's and are in the 1.5 GSF zone instead of 2.0 or 2.5 and because they have the high BC they retain their super sonic velocity farther even in the same cold air, they also maintain their accuracy to 1k. I think that bullets "know" for lack of a better term where they are in the speed of sound barrier and accuracy may be invloved. May be there is some relationship between each of these.
Many unknown mysteries here and alot of speculation. This is just what I have found in my tests.
Also these are thoughts and opinions and speculation and guesses, I dont KNOW why this occurs.
Any particular loads this is happening with??
[ 01-19-2004: Message edited by: meichele ]
Long range shooting is a process that ends with a result. Once you start to focus on the result (where the shot goes, how big the group is, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.