Tuned Windage Compensating Knob from Kenton
Here’s something that can save you lots of time and aggravation on a varminting trip. This little $70 gizmo is great for varmint hunters and any one who needs to make a quick shot in shifty wind conditions. Instead of the traditional 1/4-MOA hash marks, the Kenton windage turret features markers corresponding to the wind drift your rifle will encounter at various distances.
Kenton Industries’ Tuned Windage Compensator (TWC) has built-in windage marks for 10 mph cross-winds at 100-1000 yards. How do they do that? Well the knobs are calibrated either for specific calibers/loads, or they can make custom knobs using your observed field data. The knobs can compensate for various wind speeds (2-20 mph) and angles (15°- 90°), by applying some simple conversion ratios. As a general rule, with a “full-value”, i.e. 90°, crosswind, the wind drift will go up or down in direct proportion to the change in windspeed. That means, for example, at a given distance, a 10 mph crosswind will push the bullet twice as much sideways as a 5 mph crosswind.
Two versions of Kenton’s TWC knobs are offered. The $69.95 TWC #1 features calculated ballistics for your caliber and barrel length. The $79.95 TWC #2 or #3 feature customized windage settings based on bullet BC, environmental conditions, elevation, and ballistic information you provide.
Kenton also makes an elevation-compensating TTC knob, that can be customized to your rifle. With this elevation turret, yardages are marked in 50-yard increments, and you can literally just “dial in your distance”. However, to work effectively the TTC knob must be tailored to a particular load (velocity and bullet). Moreover, actual bullet drop will differ with changes in altitude, temperature, and shooting angle — so it’s not as simple as it sounds, and you may need multiple knobs if you shoot a variety of loads.
Two more links to the plagiarizer Mark Osterholt / Wayne Rommel
The Mark Osterholt Files has tons of information on this lowlife, as does markosterholt.com