This was an issue that I had earlier, but it took a while to finally understand the relation between the headstamp and the issues I was having.
I'm using an old Bonanza die set to load .45 ACP, combined with a Lee Expander Die to maintain compatibility with the Lee Auto Drum. Earlier, I had issues with some pieces of brass. After the seating and crimping steps were complete, the bullet failed to be properly taut within the case, requiring only a gentle touch to push the bullet into the case, and I could easily twist the whole bullet out with gentle force with pliers.
Thinking that it was something wrong with the brass, to double check, I loaded up a Speer headstamped .45 ACP case, and the boolit seating and crimping was perfect. But, when I did the same with this R-P headstamped brass, the bullet was left loose in the case. I had attempted, as an experiment, to get the R-P cases seated, but they required so much crimping force that it ruined cases made by any other manufacturer.
Has anyone else had a bad experience with loading R-P Brass? l have no idea why they have given me so much trouble. I don't think that I've heard of the company to be honest. Either way, any other R-P brass I've used has worked just fine for me.