Yes, because you will be removing material, you will end up having to polish the surface of the horn up with finer abrasive papers or pads. Very easy process, just take your time. :thumbsup:
On another note, I also prefer to enlarge the channel opening of the horn. This allows me to affix my small funnel for filling with powder. Some horns have a removable plug in the rear that serves the same purpose, again personal preference.
I usually enlarge mine to 3/8' with a standard bit, progressively stepping the size up on each additional hole because you indeed run the risk of splitting the neck of the horn if you use to large a bit to fast.
On another note, I also prefer to enlarge the channel opening of the horn. This allows me to affix my small funnel for filling with powder. Some horns have a removable plug in the rear that serves the same purpose, again personal preference.
I usually enlarge mine to 3/8' with a standard bit, progressively stepping the size up on each additional hole because you indeed run the risk of splitting the neck of the horn if you use to large a bit to fast.