1. Does anyone paper patch their .450 BPE bullets? If so have you any tips (I have the Paper Patch paperback)
2. Can you/should you (does anyone?) shoot FMJ ammunition in a BPE rifle using BP?
If your Paper Patch paperback is "The Paper Jacket" by Paul Matthews, then that is a good source of info. You can find a ton of information on the internet too.
The mold that came with the gun may or may not drop the desired diameter bullet for paper patching.
When you ask about shooting FMJ bullets in a Black Powder Express rifle, did you perhaps mean to ask about regular soft point jacketed bullets, and not FMJ bullets?
