Coning, crowing by eroding and/or filing a fancy muzzle are all different treatments.
A cone is a tapered cone - ie: deep - can be up to 2" or more by some makers, where the lands are tapered from smallest diameter, out to just larger than groove diameter - very gradually. This is coning as I understand it.
Crowning is a muzzle end treatment where a tool or a tool and emery or simply more time and emery is used to radius or angle cut the muzzle's very end, to allow easier loading, but does not extend down the bore more than a very short distance, ie: 1/16" to 3/16" deep.
Most filing, as in a fancy 'hiney' muzzle is an 'after-treatment' - done after conding or crowning. This is typical of most ALL original Jaeger rifles.
I recall the article in MB, where the writer filed the lands out to deeper than the grooves, then notched the grooves with a sharp V file as well. Pretty cool looking - so- what he did was crown the rifle with a file, not cone it.