Same POI at variable X Zoom ?

WhelanLad

WhelanLad

CGN Ultra frequent flyer
Rating - 0%
0   0   0
Location
Australia AU
Hey, is it fact, fiction or something in between that all Scopes will be "Zero" at any of the variable Zoom ranges ?

for example, you zer o in with 24x an later proceed to shoot on 3x , is it expected that Zero will be exactly the same, or is there some margin for error likely?

i feel reticle thickness would play a part?

i was suprised that my partner shot the 100m target , failing to realise it was on 2x (i know, women....) lol so she zoomed up an shot 200m gong, then i said to zoom up (7X) and shoot the 100m again.
POIs were the same.
2-7x28mm vari x loopolder

id have expected a different result almost, im not sure why
 
SFP scopes can be susceptible to a little bit of error as the reticle physically moves with the lense group as magnification is adjusted.

Most people would never notice it, but it depends how small you are trying to shoot....

Alex Wheeler built a 'scope checker', it's designed to mount 2 scopes on the same rifle. One scope is 'frozen' (internals are bonded with epoxy) to ensure no mechanical movement.

The rifle is fired and the two scopes are compared on 1/4grid graphing paper at 100yd

He found upwards of 1/2MOA movement in POA of some very well regarded scopes as they were adjusted through the magnification range.

He found some Japanese made Vortex scopes (Razor LHT and Golden Eagle) to be nearly perfect at maintaining 'zero' through the magnification range.

The results were so controversial and inflammatory that he had to pull them down, but they are referenced often over at Accurate Shooter if you search 'scope checker'

FFP scopes are immune, because the reticle is fixed in space ahead of the erector.
 
One thing I’ve learned about shooting is not to believe or trust anything you can’t verify or prove. People have a lot of faith in zeros not shifting and scopes tracking true like they are supposed to,

That easiest test I’ve found is to get ahold of a target grade .22 and mount up your new or suspect scope. Target .22s are a dime a dozen, the one I use is an Anschutz that was set up for rimfire benchrest, paid a few hundred for it years ago. Shoot at 50 yards and crank the snot out of everything that moves. If it doesn’t move the expected amount the first time everytime, return to zero, and as is the topic, hold zero through-out the magnification range on .a 22 it sure isn’t going do it with something that recoils. The difference is one way costs a few boxes of 22 shells and a few hours, the other way costs real money and you’re fighting barrel heat.
 
You must log in or register to reply here.
Back
Top Bottom