My Labradar also doesn't reliably track past 75 yds, but that is a known issue for bullets of .22 cal. and under. Sometimes it tracks out to 100 yds. Larger bullets do fine out to 100 yds. I have not tried it with my PCP rifle yet. But even if it only tracks out to 75 yds., that's still enough to calculate BC if you wish to do so. I bought my labradar primarily for use with center-fire cartridges anyways.