Thanks for the comments everyone. The gun was built by (likely sold by) SW Silvers of Silvers pad fame. (More pictures added to the original link). The barrels are 28” with 3-1/4” chambers. Agreed, work up the load to the gun. For how I will use it stateside, I’m pretty happy if it regulates with a lighter load given its weight. If the targets continue to hold up, the left and right are just fine. It will be interesting to see if an increase in the load will bring barrels closer together up/down. Thanks again.