Only insofar as weight affects the length of the projectile does it factor into the stability of the bullet for any given twist of rifling. Hollow pointing will not, unless it markedly changes the length of the bullet, affect its stability in flight.
Why drill your bullets? If you have a mould that produces what you want except for the hollow point, a swaging die is both quick to operate and cheap to make.
I remember seeing a trimmer mounted hollowpoint toolhead from one of the major mail order supply houses. It might have been Midway. This was in the catalog. BTW Midway does not always have all of the items in the catalog listed on their web site.
John ... Your experience confirms a suspicion I had about the use of this tool. I assume that this has to be done on a loaded round. Assuming the bullet was seated even slightly off center or the case was not perfectly concentric the hollowpoint would be also, throwing it out of balance. It makes common sense that a swaged HP would be more concentric as you are dealing with the bullet only and eliminating other factors that could cause an out of balance bullet.
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