As mentioned--I would saw slightly longer and then finish in lathe.twenty rounds of 3/4" 1018 to 4.5" +/- .003? Ends must be faced and nicely finished (no saw marks). This is a "production" job so time is of the essence. I have a power bandsaw, lathes, mill, etc. No CNC.
As mentioned--I would saw slightly longer and then finish in lathe.
If these are 4.5" long, I would place in chuck with a parallel between face of chuck and stock. LIGHTLY tap stock against parallel and machine.
Use a tool with small radius that is honed.
If surface is not satisfactory, leave a few thousands and grind as suggested.