Thank you, TAM! I have a new scope yet to be zeroed, so have been doing a lot of reading on the Santos Improved 50 Yard Battle Zero as of late. Your description and reference materials provide the most succinct explanation I have seen to date.The Annoyed Man wrote:Fortunately, there is a far more practical battle zero for the AR carbine that has a much smaller vertical spread, and that is the Santos Improved 50 Yard Battle Zero: http://aesirtraining.com/home/rifle-zero/.
If you zero your carbine at 50 yards instead of 25, your bullet's POI will never be more than 2" above or 2" below POA all the way out to 250 yards. That truly is a point and shoot zero with only a 4" variation across that distance. 250 yards is far more likely to be within the capability of the average shooter, and it is also well within the ballistic sweet spot of the cartridge.
One question, as the ballistic and physics seems quite similar for M193 and M855 cartridges... Do you have experience with heavier, 77 grain HPBTs and the difference when zeroed at 50 yards? Almost all I have read addresses 55 and 62 grain munitions. I have stocked up a combination of M855 (62 grain) and 77 grain rounds. I'd like to both re-zero my irons using this method and the new scope.