pressure difference

[jeff]

How much pressure difference between 44gr 5744 and 330grn bullet and 150grn buckhorn 209 and 300 gr bullet.

Because I talked to a local that is shooting 44 gr 5744 out of his Thompson encore. What is the weak link, barrel, receiver, or breach plug?

If there isn't much pressure difference is he risking a blow up?
Its hard for me to talk safety to him when I really don't know these facts?
Jeff~

[killitgrillit]

Jeff, I think the difference is that the encore breech plug is not designed to handle the pressure and the flash hole is too big.
If I'am wrong someone please correct me.