Rifle Scopes Expected elevation adjustment range for Nightforce NX8 4-32 on Seekins PH2

[rmiked]

I have a NF NX8 4-32 mounted on a Seekins Havak PH2 with 20MOA base. The NX8 advertises 90 MOA vertical range. After sighting in at 100 yds I have 57 MOA vertical adjustment left. I expected 65 (45 +20). Would you expect to get 65? NF said they will check out the scope as I only dialed down 13 MOA to get sighted in. I have asked Seekins if their receiver base was parallel to the bore. I’m sure it is but that would explain not having to dial down 20 MOA if it wasn’t. My 100 yd sight-in is about 3” above the bore so that’s 3 MOA at 100 yds. I have never had a canted scope base before and just didn’t know what to expect. If I put the POI back to the bore centerline (dial down another 3 MOA) that would result in 60MOA up travel. Maybe that’s close enough?

 

[jbuck88]

I have never owned a rifle where the scope was dead nuts centered to get a zero. I would call it a good and go shooting.

 

[4O6shootist]

That's not how it works. You lose some your rail angle with sight height and bullet drop with the 100y zero. Let's do some math, 20 mins of a 360 minute degree is 0.056" per foot, convert to 100y zero is 16", subtract bore height, and bullet drop from muzzle to 100y, prob an inch or two, now you're looking at 11" or roughly 11 moa. Your scope has 45 moa from optical center, add that 11 moa, and you're at 56 minutes. Which is near exactly how much you have available. It all maths out to me........