I've been considering getting a 3.5-15x50 NF NXS with NRP1 (1moa scale) and wondered if I could do this same trick with that optic....and sure enough, you can.

First, we know that 1 mil=3.43775 moa

We know the style scope mel mentions is set for 10x.

So if we investigate, a 72" target=6.8755 moa at 1,000 yards [72"/(1.047 *10)]@1000 yards.

The values are then doubled at 5x, 1 mil=6.8755 moa. At 5x, the target should read 2 mils for a 500 yard range.

So, we know we can take the formula, 72"/(1.047*5)=13.75 MOA. At 500 yards, the mils read 6.8755 moa each, therefore two are 13.75 moa, just as the formula predicts.

So how does this work with your scope you ask? Well if you have a 3.5-15x50 NF NXS and the 1 moa scale, you can apply the same logic without converting anything to mils.

At 1500 yards, 1 moa=15.705" per previously established formula. Therefore, 72"/15.705"=4.58 moa. On the NF NPR1, its read in 1 moa increments, so a 72" target should take up approximately 4 1/2 tics.

To check this for other ranges, we can convert our moa scale for the different powers. So if the scope (which it is) is set to for the moa scale to work at 15x, we know that 15/10=1.5...so on 10x, the tics are 1.5 moa apart. At 6.5x, they are 2.3 moa apart.

So let's use the same logic over again to check. So theoretically, if we dial down to 10x, the target should take up the same 4.58 moa at 1,000 yards. Let's check it out...at 1,000 yards, we already know a 72" target is 6.8755 moa. We also know our tics are 1.5 moa apart now. So we can divide 6.8755 by 1.5 moa and get 4.58 moa, just as predicted.

Let's work it over again with the dial at 6.5x. At 650 yards, a 72" target is 72"/(1.047*6.5) to get 10.5796 moa. At 6.5x, we can find our scale now reads (15/6.5) 2.3077 moa per tick. So we can take 10.5796 moa (size of the 72" target) and divide by 2.3077 to get 4.58 moa yet again, or approximately 4.5 tics at 6.5x at 650 yards.

So the goal here is to fit the target into about 4.5 tics for a close approximation. We can take the power reading when the target fills 4.5 tics and multiply by 100 to get a quick range estimation.

After trying it several ways, I'm pretty sure this method will indeed work. If anybody can find flaws with it, please let me know. If not, looks like a good quick and easy no-math way of ranging with ANY calibrated scope so long as you can work out the math one time.