Duplex with Black or one of the substitutes are a good option. Old advice including many good sources Recomended wads. Current practice among competition shooters using big cases is allmost universal no wad. Problem with the wad is if it moves and leaves air space it can cause chambers to ring.
What changed many minds were Charlie Dells experiments published in the ASSRA journal In the late 8os. He had a rail gun and under ground 100 yard test range. Chambered a barrel screwed it on tested, cut the chamber off re threaded and chambered , tested again. He could ring a chamber on demand with improperly placed wads.
Since only place you see wads in competition are modern striker action single shots chambered in 32 Miller or 32 Dell. Both based on 357 Maximum cartridges breech seated with a case full of fast pistol powder and wad on top. Case full the wad can't move and case full you can't breech seat without a wad. Spill powder in the actiion. Same guns chambered in the longer 32/40 nobody uses a wad.
If I had that big 50 and wanted to use smokeless would use TrailBoss. It's formulated for just that job and probably the most often used in Cowboy Action Matches. I have never duplexed, it's not allowed in NRA rule matches, but believe it's a very good option to reduce fowling.
William
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