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I bought the same gun, but not the bull barrel version.
To use as a test mule, for accuracy and load development, for my 20 bore double rifle project.
I have been using Cheddite multi hulls 3" and also RMC custom brass.
I have only scratched the surface but it has proven to be a sound platform.

Nitro

PS: See my thread in this forum.

PPS: My RMC 3" fits the 3" chamber no problem as well as Alcan 20 ga brass and Fiocchi brass cases.(both 2.5")