Yes, thank you. Numerous people have joined in this thread and have given lots of valuable information. Thanks to all. I have now ordered both a small base die and also a set of redding competition shell holders. Those will take 1 to 2 weeks to arrive due to delays in corona-shipping. Once I get those I will tinker around with them at my bench, trying different adjustments on my regular die, the small base die, and the competition shell holders. I will update this thread with my results when I get it all worked out, but don't expect anything for 2-3 weeks. It will take some time for the shipping of the new items, then for me to load, fire, reload, fire, reload again, etc. to make sure I have the issue resolved. No offense to anyone but I'm not going to be doing any chamber casting. I think die adjustment, competition shell holders, and a small base die are good places to me to start. Thanks again to all.It seems we have taken this thread off on a tangent, so maybe you could start a new thread on how to properly cast a chamber.
OP, have you found your issue? Do you have anyone local to recheck your work?