Track sells rod tips - I usually use ctg. brass. Modern pistol brass in 9mm, .40 and .45 might be useful. .30MI Carbine, .223 and .308, .30/06 etc brass is also useful for small to large shafts.
.223 brass cut off, then deprimed and cupped with a drill or ball mill, - 3/8" common sized hickory shaft filed or turned to fit inside, pinned in place & epoxied or CA'd for the shaft or epoxied or CA'd into the starter's knob works for us.
Simply bashing the ball into the muzzle worked for years in the .50's and larger bores we used to use. Then one day day checking some patch material in a strip, I bashed a .400" ball into my .398" bored rifle then pulled it out to check the markings on the ball and the condition of the material. What I saw was lead pushed up on one side, but not on the other due to the 'angle' of the surface of the starter's knob when it it the ball. The ball was actually started 'crooked'. Now, if a large bore, this might not make much difference. But in a smaller bore where 'tings' have to be more perfect, it could indeed cause an unbalanced ball and effect accuracy. That is when I switched to using the short cupped knob to start the ball below the muzzle, before pushing it down with the large end.
My short video on loading my .58 Kodiak shows the bashing method as well as a long stroke on the rod vs. short stroking it. After bashing it in with one blow, the ball, when viewed from the top, sitting in the muzzle does not look harmed at all, BUT - this method can easily cause the ball to be started crooked- ie: lead pushed up on one side or the other - this must create instability at 'some' range as it is damaging the side of the ball just ahead of the mid-way point.
Taylor's video also shows the bashing method that we used for years.
In this one, I'm using the little stud at the start of the video. Note - I am using a .445" ball and a 10 ounce denim patch. I've fired over 50 shots that day, with NO wiping. Notice how easily the ball starts and goes down.
I must apologize - while my vocal input does sound condescending I did not mean to be.