very accurate !!, i just bought one several weeks ago for the .223 Rem., trimmed over 1,000 G.I. cases to 1.740", i mounted mine on a 1,400 RPM motor with a 1/2" chuck on the motor shaft. the inside of the trimmer is a "live" bearing with the dimensions of the case shoulder
after sizing, when you insert a case to be trimmed use a gradual pressure on the case then increase pressure till done, the case holder will stop spinning due to hand pressure against the shoulder.., one word of
caution, wear a glove on your hand or you will get a blister on your thumb and index finger.., i know this from experience, i now have a very sore thumb and finger....., my trigger finger !!
