2drop, I don' t think there is any difference in draw length with a rope release compared to caliper. When I switched to a release from fingers the guy at the pro shop said the rope was easier on bow strings at 60# or more, back then it probably was true but today I don' t think the caliper release is detrimental to your string. I still shoot the Fletchmatic (better known as Flinchmatic). I have just stayed with it over the years.