Yes green, your way may work for some T38 rifle chambers, but the cases will still come out conforming to the dimension of the factory 6.5x50 sizing die which may be too small. The reformed .308 cases will have thicker walls so maybe case expansion may not be so visually evident after firing. But for my particular rifle, I had to alter the sizing die to get a better fit. And most of the sizing dies I used are readily available, if you are a .45 cast bullet handgun shooter you may have them already.