When I had the breech off, I noticed that the hole in the breech and the barrel are slightly smaller than the transfer port.... I think that needs correcting....
Lol...of course you do

I have one request. Do that correction and the epoxying of the dead space in separate steps. I'm really interesting in seeing the effects of that dead volume

50+ FPE....Astonishing. And simple

All those fellows that are always kibitzing about wanting more power should take note of this thread. Get your PAL and have att'er. There is no complicated machining done here