All I did with all my 303's apart from the 1921 Lithgow (Which is a safe queen) is carefully and I stress carefully polish the flat & tip of the sear then the same to the "nose" of the cocking piece then the nodes on the trigger as well as polish the retaining pins for the trigger & sear this is done with a small hand held super el' cheapo dremel (as I am really cheap) from Bunnings that stops cold when any type of pressure is put on it took a while to do them, no angles were changed or hard facing, I now have buttery smooth 1st pull & let off.