- IF YOU THINK you are going to mount either scope on a rifle and then go and kill game at long range, you are kidding yourself. Unless you have actually practiced with them, you'll miss.
- YOU NEED AN ACCURATE RIFLE. The ones I used were minute of angle, and I would not settle for less. You do not, however, need hypervelocity. The Cabela's system can compensate for speeds as slow as 2700 fps, and the TDS can work for even .22 Long Rifle bullets at 1200 fps.
- SHOOTING AT 300 YARDS is comparatively easy. Once you get to 400, things really get interesting. Four hundred honest yards is a horrendous distance, and I would not shoot beyond 500 under any circumstances.
- BEYOND 300 YARDS, accurate range estimation is crucial. For example, the Cabela's scope allows for 23 inches of bullet drop between 300 and 400 yards, and 44 inches between 400 and 500. So if you use the 500-yard aiming point on an animal that's 450 yards away, you stand a good chance of missing.
- YOU WILL NEED A ROCK-SOLID REST. Holding precisely at these ranges is tough, and even small aiming errors are greatly magnified at long range.
- IF YOU USE THE WRONG CROSSWIRE for a given distance, you'll miss-badly.