Thread: Bought a new basic tactical scope today

Tested at 180 and 400 metres today. POI was spot on for both. Dial reads .2ml on the lower scale of the dial at 180m on the top scale of the dial for zero, but from that point on, the POI's and dial readings seem to coincide very closely or exactly. The maximum error would be 5cm high at 75 metres and 3 or 4 cm high at 40 -150m
Therefore the theory I calculated works fine in practice.

For different bullets, Mv's, bc's etc the zero range would have to change from the 180 m zero I use but in essence, for most hv cartridge loads this system would work fine at medium ranges at least out to 700 metres, perhaps more.

In principle, if you plot / graph the trajectories of various loads one over the other, with the key trajectory being the US military .223 which the dial is calibrated for with a zero of 100yard, and then move the other trajectory lines until best fit is achieved over the key one, you should be able to determine a compromise zero range instead of using the 100 yard zero used when Leupold printed the dial. The resultant errors will be small but will be greater on slow poor trajectories than faster flatter ones.

Of course, at longer ranges, the 223 will start dropping away quicker than some loads so errors might creep in at extended very long ranges. With my load this is not an issue, but it could be for some.

For more detail and clear pics of the P5 dial, look up AR mod 1 Leupold and P5 dial; -also their ballistics handbook to better understand the theory.

For, I now need more practice alongside a friend with much sharper visual acuity than I to spot POI's on the discs for each shot.

Incidentally, the specs for this scope seem to be more or less equivalent to the Leupold VX1, but my impression of the sharpness and clarity my scope is exhibiting indicate to me something superior to many other more expensive scopes I have looked through recently. I have been amazed frankly.