Was it worth it? Don't know for sure, but won three CBA National Military Rifle championships over the years with the same 400 case lot of brass.
On a Wilson or C&H case trimmer where the case is pushed into a metal sleeve for trimming, if you turn the case around the cutter will square the base of the case. Bases are not normally perpendicular to the case body, but are wavy or tilted or just not flat. I trim them back until about 20% of the base is aligned with the body. This usually only takes about .005 to .010", but you may have to fire form them once to set headspace.
