Trying to make a round nose reamer for .308 for a couple different projectiles. Has anyone made one with a file? The reason I ask is the compound radii on the ojive seems a bit tedious for the use of a radius tool. I'm not a very patient wanna be machinist. This is for 100 yd accuracy in the 4" to 5" grouping, not sharpshooter accuracy.
Thanks,
Bill