I use larger round tips for very course texture and almost a needle like tip for finer texturing. I have never used anything other than cone shaped tips, but I usually stipple at a ten to fifteen degree angle to the surface.
Glocks I do not own: 18, 25, 31-33, 36-39. Shooting these brands: Beretta (1), Colt (3), FN (2), Glock (14), Mega (2), Remington (2), Ruger (1), Smith & Wesson (1). Suppressors (2), SBR's (3)