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Posted: 2/10/2015 6:56:18 AM EDT
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need some advice...I'm just an RDS user for a while and finally decided to go variable and basically new to magnified optics.
gonna be shopping for ammo and getting it zeroed....was wondering how far and what bullet weight is best to use and be accurate with the BDC drop points. NXS 1-4x24 FC-3G with a pinned 14.5 barrel http://imageshack.com/a/img661/1404/jP0tIz.jpg http://imageshack.com/a/img911/9696/15rNWO.jpg |
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Quoted:
need some advice...I'm just an RDS user for a while and finally decided to go variable and basically new to magnified optics. gonna be shopping for ammo and getting it zeroed....was wondering how far and what bullet weight is best to use and be accurate with the BDC drop points. NXS 1-4x24 FC-3G with a pinned 14.5 barrel 
 See page 2 here: FC-3G reticle user's manual Most variable scopes are designed to be zeroed at max power. |
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The chart in your manual specifies to zero at 200. For most loads in an AR15, this will also be a 50 yard zero, the first place where the trajectory crosses line of sight, with somewhere between 200 and 250 being the place where it begins dropping below the line of sight.
This is an ideal sighting method for just about any scope that is not a dedicated target scope. The page of the manual showing the reticle has a list of .223/5.56 loads that the subtensions closely follow. BTW: If you want to get really accurate, get some ballistic software (many versions are free on-line or less than $15 for their deluxe version), that will allow you to fine tune the distances for each subtension. Don't be afraid just because this is your first scope. Zero it at the range for 50 yards with inexpensive XM193 55 grain FMJHP ammo and see how well the subtensions work with your load. They might turn out to be very close. I think the scope is second focal plane, which means that the marks on the reticle will only be accurate at maximum power, but that is how you will probably shoot it at longer distances, anyway. It may be first focal plane. If it is the latter, the reticle will appear to "shrink" compared to the target as magnification decreases, but your hold overs for extended shooting will be usable at any magnification. I can' tell from the manual. |
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Depending on ammo, barrel length, twist rate, atmospheric conditions, etc. your 50 yrd zero may be off a few inches above or below dead center at 200 yds, but you should remain in the ball park and within the kill zone. I would prefer to be dead center at 200 and slightly off at 50. YMMV
BTW, that's a nice set-up. That scope is in my future. |
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