I routinely file the points on Speer .321 170 gr. They are marketed as bullets for the Win .32 Spcl....but the points are so pointy they make me nervous in the tubular magazine of my old 32-40. Anyway, no loss of accuracy. Then, I tested some in a 8x57 J bore (actual .320 groove dia) at 2660 fps and in spite of the flat point and paper thin jacket they held together pretty well in a soft pine board medium.
