Daryl: no, once heat treated the flint will no longer be any good for your rifle. Heat treating flint is for spauls of flint, whose properties change during heat treating yielding stone that flakes more easily and leaves a glassy scar...projectile points. The edge created on flaking heat treated flint is thinner and sharper than prior to heat treating, and the resulting point is more beautiful, as well. Many kinds of flint change colours into some amazing hues.