Just bought a Night Force 2.5 x10 and a BoBro single level mount, so I was trying to figure out the bore height for my ballistic calculations, and I so far haven't found any consistent info on the web. So here is my logic of how I found the exact bore height, and if I'm wrong, someone correct me.

1)The Bobro specs state that the center of the optic is 1.420 inches above the flat top of the picatinny rail.

2) I'm assuming that the top of the picatinny gas block is even with the picatinny rail of the upper receiver. Using digital calipers, I measured from the top of the gas block rail to the bottom of the rifle barrel which gave me 1.63 inches, and I then measured the diameter of the rifle barrel which was .75 inches. So my calculation are as follows:

Bore Height = Scope height + Gas block to bottom of rifle barrel - (barrel diameter /2)

Using actual measurements I get:

Bore Height = 1.420 + 1.63 - (.750 /2)

Bore Height = 1.420 + 1.63 - .375

Bore Height = 1.420 + 1.255

Bore Height = 2.675 inches

I know some would just round off the values to 2.7 inches and I'm find with that also because I'll never shoot better than the difference between the bore height of 2.675 and 2.7 inches. The difference out to 800 yards would only change by .02 MOA which is way beyond my skill and the accuracy of the rifle and ammo that I will be using.

So does this calculation look correct?