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Sinclair Comparator is a great tool to sort bullets by base to get the length. This is an essential step if you plan on trimming the bullet meplat. However, when sorting a lot of bullets, a digital caliper might be a better choice for some handloaders than a dial caliper.
Sinclair Bullet Sorting Stand (#59-2000) is another tool you can use to sort bullets with its own unique comparators.

Our Sinclair Bullet Comparator can be attached to the blade of your caliper and uses inserts for each specific caliber. The inserts are made of stainless steel and machined with a taper and a short straight section to more accurately duplicate the chamber throat, avoiding the wobble experienced with many comparators that have standard drilled holes.
Our design allows you to quickly and accurately measure the bullet's bearing surface. The comparator inserts are available in 17 to 45 caliber, and can be used in both the Sinclair and older Stoney Point comparator bodies. Please note that these inserts are not intended to measure rounds seated to magazine length or shorter, for this application, you can use our Sinclair Bullet Comparators (#09-600 and #09-700).