Re: Matrix 117g 6mm not stabilized in 1-7.5??
I just opened up the calc program, and it indicates that the spin imparted onto said rounds at said twist and velocity is equal to 316,800rpm, which (I believe) should be far in excess of what is required to achieve full stabilization. So that definitely not the problem. Oxymoronically speaking, it may be due to your spin being TOO fast, at the velocity that you are spitting them out at, for the thin-jacket bullets to be able conform to. With too thin of jacket, too soft of lead, too fast of twist, the rifling lands can "skid" over the bullet, unable to stay within the grooves cut by the leading edges. This will "skuff" up, or even de-form the bullet, throwing the accuracy off, AND also could prevent it from achieving full rpm. Spinning something up from 0 to 316,800rpm in just a few milliseconds, while accelerating it from 0 to mach 3 within the same time frame, puts EXTREME (difficult to imagine) forces onto it. For your bullets to work, you would need to either send them at a lower velocity, or change to a SLOWER twist rate. Yeah I know, those wouldn't be acceptable options for me, either!