I have been using a ballistic drop compensating turret cap this fall on several hunts. I love it. Mine is from Kenton Industries, True Trajectory Compensator.
I was just thinking about your comment above:
Looks good if you use the same load all the time, in the same temperature, and same elevation.
I guess that statement could have been made about a drop chart, too. A printed drop chart is what most of us rely on...with a minority using a PDA with loaded ballistics software. So when relying on either a BDC turret cap or on a printed drop chart we have to be prepared to make adjustments for ambient temperature, altitude (as we hike higher in the day) and even pressure changes due to weather.
For my own use, I used my ballistics software to predetermine that the following units resulted in the same change in drops:
- 20 degrees
- 1,000 feet
- 1.2 inches pressure
Each is worth 0.1 MOA at 500 yards and 0.2 MOA at 700 yards and 0.3 MOA at 900 yards for my flat shooting 7mm Dakota cartridge. Pretty easy to adjust in the field for that with a BDC turret cap, won't you agree.
Whether relying on a printed drop card or a ballistic drop compensating turret cap, we must be prepared for slight adjustments. Where I hunt just recalling those few reference points is enough. For others, a more elaborate card system may be needed unless you go the route of the PDA. But I don't feel that reduces the convenience of the BDC much at all. And the ease of simply turning the dial to the yardage marks makes any necessary environmentally based changes very much easier.
Now, having said that, the BDC is not for and the makers tell you it is not for...those hunting from day to day or hour to hour in major
changing conditions at yardages well over those stated above.