My least favorite part about making cones is trimming them to the correct size to fit the barrel. Does anyone have any tricks up their sleeves to make this process quicker and easier?
My method is not the greatest but it's a whole lot better than marking them and cutting with scissors. I made two sacrificial cones and put them point to point forming an hour glass shape and taped them together to hold them in that position. I then slid them into a section of barrel. The idea is that the open end of the upper most cone holds the point of the shaft in roughly the centre of the bore while the cone is trimmed with a box cutter or other really sharp knife.
Rather than using cones as I did, I'd recommend using a section of dowel reduced in diameter to snugly fit into the bore so it holds itself firm but can also be pushed in one direction up or down within the bore section to allow for different lengths of shaft. Push the new dart and cones down into the bore until the dart's cone comes in full contact with the bore, then trim off the excess cone.
I forgot to mention that the dowel piece should have a hole bored in it's centre large enough to accept the size of dart shaft that will be used with the dart you are trimming. If you make a small enough hole in the dowel and don't trim your cones until after the point has been sharpened, the shafts will self centre themselves in the small hole in the dowel while trimming the opposite end at the cone.