Breech Seating

[Don McDowell]

You use a camming tool that is sort of a dummy case that pushes the bullet into the barrel then you chamber the case
Some of the ODG loaded with as much as 1/16 in between the case mouth and the bullet base
A number of the Creedmoor shooters “muzzle loaded their patched bullets and then chambered the loaded case. I am assuming they used a loading rod they had a depth stop on it.
IMHO breech seating and muzzle loading a cartridge rifle were more of a way to get heavier powder charges. Today we have loading presses and compression dies that are lite weight enough they can be carried by hand and are able to achieve the same result