I have read some on these for use in the 300 black out... Just realixed that they make them for handgun calibers...and one of a 40!!
http://www.lehighdefense.com/collections/bullets/products/400cal-10mm-140gr-xtreme-penetrator-bullet
https://www.youtube.com/watch?v=f6-JmzXF6Zk
Guess I NEED some!!
CW
Yes Underwood is selling some loaded in their line up! We have the Pull-Down documentation as well.
http://10mm-firearms.com/factory-10mm-ammo-pull-downs/underwood-140gr-lehigh-defense-xtreme-penetrator-pull-down/ (http://10mm-firearms.com/factory-10mm-ammo-pull-downs/underwood-140gr-lehigh-defense-xtreme-penetrator-pull-down/)
http://10mm-firearms.com/factory-10mm-ammo-pull-downs/underwood-140gr-lehigh-controlled-fracturing-hollow-point-pull-down/ (http://10mm-firearms.com/factory-10mm-ammo-pull-downs/underwood-140gr-lehigh-controlled-fracturing-hollow-point-pull-down/)