I fiddled around with one of these and discovered the chamber was very generous. A couple of loads and I was getting insipient case split just above the rim. I was making the brass from .30-30 cases.
The only reason you would get case splits after fireforming the cases with the "first fireing", was because you pushed back the shoulder of the case when sizeing after fireing!!
The cases have to headspace on the shoulder NOT the rim!!
Once fireformed those cases should last just fine "if" you don't oversize them before reloading them!
Wirehair,
I wouldn't have any problem fireing some cases in the rifle, and then reloading them with 228 bullets, as long as you pay attention to what i said above.
Drilling Man