Here is recap simple setup to get faster loads with 12ga sabots
& slugs, Example using break actions...., reaming chamber
in a 12ga break action to 3.5" with a 3.5" 12ga reamer, that isn't
something needing special order, and use 3.5" plastic cases , or
get 3.5" brass cases made. With mag shotgun primers and
our slower powder loads you can get a quarter more speed,
which gives 50% more energy...
585 Hubel Express video, 190ft/lbs recoil, heavy load, gun little light.....
https://www.youtube.com/watch?v=tyS9zZ8ElJA
Another view of Asteroid Precision's.... 375 HE target gun,
Here is our 416 HSM we are developing next to 416 Barrett, Ed