Wood is more abrasive than Delrin or metal rods when used for long-term, repeated cleaning due to the fact that it is more porous and particles embed
Agree. However, this thread has so many issues that can be replied to I have, up to now, deferred.
Wood is probably not harmful to barrels unless you are using something with a high silica content. e.g. Osage Orange.
Delrin does not attract and hold grit.
Stainless steel, as in BB test, can maybe wear barrels.
But, isn't all this talk mute for most shooting with the use of bore guides?
I clean my wood rods with lemon oil after use and even wipe them during a shoot.
I wipe off my Delrin and it does leave dirt on the cleaning cloth. Same with my stainless range rods.
I use Delrin or stainless for safety. Wood is used for ronny, reenactments and display.
Sorry some here don't do much shooting. It is fun. At a club shoot we fire 20-30 times. With swabbing and loading and final cleaning, the rod gets probably 100-200 swishes up and down. Being careless could (probably) do wear damage to a barrel.