These are images from the thread that Keith referenced. Fluid Steel barrels. Using Sellier & Bellot 1 1/4 oz. at 1215 fps. Proved for 1 1/4 oz. 2 3/4" shells.





another new fangled steel barrel. Used Perazzi MX2000 barrel. 3" 1 3/8 oz. Kent Bismuth shell. MWT at burst .012".