My .44-100 Rem St.

[Kurt]

Don I knew what you were getting at. My chamber will not except a bullet in the case larger then .442" I use a patched bullet from .439 to .441 depending on the paper and as tight as I can chamber the round with letting the block mildly cam it in. It's to tight using thumb pressure. It's the case mouth that will not seat with a over sized bullet. Now I can breach seat a larger bullet diameter.
I rechambered the .44-75 with the overly deep grooves with my .44-90-2-5/8 bn that has a little larger diameter case neck but it still will not except a GG.