True Velocity and Sierra Bullets have partnered to introduce composite cased commercial ammunition that should be available in 2020. The cartridges will be composed of True Velocity’s steel-base polymer cases loaded with Sierra bullets. This ammunition will be initially available in .308 Winchester with more caliber options such as 6.5mm Creedmoor to be added in the future.
https://www.thefirearmblog.com/blog/202 ... a-bullets/
When I see them in the wild, I'll snag some and see what they do.
CDFingers