I tried the Army Navy CSL converted rifle today. 3/4oz slugs (328gr?) by Federal. Surprisingly accurate for two fairly quick shots at 30yds, with the left and right barrels not crossing, hitting with correct elevation but biased to the right. I'd like to explore more loads for this, and options for adding back iron sights.

Has anyone here tried loading their own 20ga slugs in the brass hulls available from Magtech?