myopicvisionary wrote:Generally speaking; and your results may vary, an AR-15 firing 55gr ball zeroed at 25yds will have a POI of about 6 inches high at 100yds. At around 200yds, the POI will be approximately 9 inches high. Continuing to 300 yards the POI will be about 7 inches high, with the bullet again crossing the line of sight at 375yds.
Most average AR shooters that I have helped do better if they zero their rifles with 55gr ball at 50yds. This provides a flatter trajectory to 250yds. The POI will be around 1.5 inches low at 25yds, cross the line of sight at 50yds and be approximately 1.5 inches high at 150yds. The round will cross the line of sight again at 200yds and hit about 2 inches low at 250yds.
With the exception of Service Rifle competitors, this is a better set up for most average shooters. The ability to control a 250yd perimeter without any sight or hold adjustments is very practical.
Thanks for the "aha!" moment.
Boresighters are nice, but I've decided to waste the ammunition on practicing the dial in of my weapons. There's something so satisfying (frustrating for others) about painstakingly zeroing in. Thank god I don't press my own ammo yet. I'd be down in the basement taking hours just to perfect each batch, and that's after I take days deciding on the weight and loading.