If you are shooting precision matches, the "consistent" crimp will result in better scores over the long run. If you are shooting action, IPSC or IDPA, don't bother. Some years ago, I did some testing. Selecting matched head-stamp/lot brass, and trimmed to exactly the same length, I prepared a box each of exactly the same load, OAL, primer, powder, etc, all loaded at the same time. Several groups of each were shot "From a Ransom Rest". The random brass, not trimmed, at 50 ft. shot a little less than a 1 inch group. The trimmed loads shot a 3/8" group. So "if" you feel the need for much tighter groups trim. If you are satisfied just under an inch at 50 ft. (probably around1 1/2" to 2" at 25 yards). Don't worry about it. If you desire to have the best possible accuracy, Trim.

__________________
H Richard
SWCA1967 SWHF244