Here is a cartridge seater I made from a Deer antler, it works good.
most of the bullets I use are from a custom mould and the bore riding section of the bullet just fits the bore no more then .002 under bore.
and when the fouling starts to build up the seater does it's job. But it's seldom that I need to use it.
On the bottom is a bullet seating tool, don't get the two confused.
The bullet seating tool I use for breach seating the bullet.
That tool pushes just the bullet into the barrel just ahead of a case charged with powder , in the photo the case has a full load of Black powder with a lube wad under the wad that is held with lust a light roll so the wad does not fall out, and the case is just touching the bullet base with out a gap between the base of the bullet and the wad.
A lot of people get these two tools confused.
Breach seating a bullet really improves the accuracy of the PP or GG bullet.
Kurt