As bad as all this sounds get it to work it means that you can regulate a safari double rifle for whatever ammo you prefer. Might upset the purists but speer 270gr are a cheap reloading proposition for a rifle that is predominately going to be used for hunting sambar.

I have a suspicion that I may have unwittingly contributed to the problem by taking the end cap off for initial inspection not knowing they kept the barrels twist relative to the monoblock.