I would totally agree with your first statement (nee 209 breech plug and hot primers). Although I get good bang from remington STS primers.
I don't think the statement about powerbelts is accurate. The only way to know that is to shoot them with BH 209 and see what happens. They are one of the best bullets for sealing powder. I don't use them for other reasons, but don't think that is a problem.
txhunter58
venor, ergo sum (I hunt, therefore I am)