I'm still working on this, but here is where I'm at so far. The case is bottle-necked with a .400 Corbon sizing die. The .400 Corbon die necked down the .308 case with no problems, but left an outside diameter of .410 on the mouth of the case which probably will not allow a .410 shot wad to be used unless the neck is expanded. The case was trimmed to an overall length of 1.180 and I charged with 4.5 gr. of "Clays" (which is the closest powder on my shelf in burn rate to use). I placed an over powder wad cut from a corrugated shoe box. The case held 112 gr. of 7-1/2 shot. A single over shot wad made from the business card was used and held in place with clear fingernail polish. No roll crimp was used as none of my dies would work for that. The target was shot at a distance of 6 ft with a commander size 4.25" barrel 1911. This round will not cycle the slide, but seemed to pattern well at that distance. I will be picking up a bag of #10 shot so I can increase the grains of shot in the load and improve the pattern.