For scopes with an "AO" adjustable objective does adjusting in mess with the point of impact? Say you're shooting at 200 yards with the AO set on 100 yards and then you change the AO to 100, will the bullet hit a different spot when still shooting 100 yards?
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It should.. which is how the objective adjusting scopes can compensate for drop.. I do not have any experience behind them.. but that is the premise so I would assume it does.. The best way to make sure is to get out there and fire it. If you are zeroed at 200 and you shoot at 100 you should be low, if you are shooting something heavy like 30 cal.. high velocity rounds that might not be the case.. What type of optic are we talking about here? -
You can shoot it at 200 with the AO on 100 but it'll be out of focus, in my experience. Moving it should not affect poi.Comment
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It should not affect anything to do with impact, that's the turrets job. The AO is for clarification.Comment
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so much wrong info hereOriginally posted by jcm151 View Post
if your zero'd at 200, you should be high at 100, how high depnds on the caliber....
now on the objective compensating for drop? not to my knowledge.... its just a focus, and with enough practice, it can help you get a fairly accurate range estimate of the target....Comment
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Talking about a Burris FullField...
I know it's for focus but I also know that when you adjust power on a scope it messes with the poi. For example, with my Nikon/my wife's bushnell/my dads leupold, when you shoot at 100 yards on 5 power and you're dead on then move to 9 power and shoot again at the same range you're a few inches high, or low can't remember which it is. Even if you look at Nikons ballistic chart for their BDC reticles its shows that at X yards on X power it's on. Confirming that adjusting the power DOES effect poi/crosshair center.
So I was wondering if adjusting the AO did the same. Like focusing the crosshairs moves them a bit too...Last edited by Cuz; 12-07-2012, 10:12 PM.Comment
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Adjusting power is just for power but doing so effects "center". Wondering if adjusting the AO, like adjusting the power, does the same.Originally posted by Bonesplitter View PostComment
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it should not move when you change magnafication either.... unless its a mil dot setup or similar where the hold overs are set at a given powerOriginally posted by Cuz View PostComment
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My current Nikon (4-12x40 not mildot) does. At 8x its dead center at 100 yards but on 12x its off (again, I can't remember if its high or low).Originally posted by trophy8 View Post
Also, how can the "holdovers" on a mildot be set for a certain power but the crosshairs aren't? They're all "fixed" in the scope right?
I'm NOT agruing here, just trying to learn and understand before buying an AO scope. ThanksComment
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That shouldnt matter at all. I shoot at 3x and 9x out of my kahles and its dead on every time. What may be happening is that holding the cross hairs steady at 100 yrds at 9x is not as easy as on 3x due to higher magnification. Magnification should have nothing to do with point of impact.Originally posted by Cuz View Post
If you are shooting a varmint reticle (reticle with hashes marked for extended ranges) the hashes under your main cross hair will change their zero with different magnification. Example would be if you are sighted in at 100 at 3x and the next hash down is dead on at 200. If you go to 9x then first reticle is still 100 but next hash is no longer 200 but would be zeroed for over 200 bc of the change of relative distance between horizontal reticles due to different magnification. Clear as black paint I know!!Comment
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Mildot or crosshair holdovers are fixed. But they may be set for 100, 200, 300, 400 at a set power of magnification. Trust me, it gets confusing and complicated but changing in magnification changes what the holdovers are zeroed at. The MAIN crosshair should not change but remain zeroed at 100 regardless of magnification.Originally posted by Cuz View PostComment
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ddavis hit it head on....Originally posted by Cuz View Post
lets take the zeiss for example, with the rapid z reticle as i just went through this, and if why i chose to turn turrets instead of holdovers on a reticle (turrets are so much easier)
your center is always gonna be your center, it should not move ever, it would be shooter error with that happening or your scope is broke!!
lets say your second mark in the scope is for 300 yards, and at 14 power the distance between center and the 300 yard mark is 4 inches.... so you zoom out to 8 power and now its a difference of 8 inches(just an example) so you doubled the distance in between thus moving the holdover, causing the shot to hit a lot higher than it would at 14 power....
disclaimer!! this is how i understand it, im no pro.... but i do think it is correct info, and someone will correct me if im wrong, especially on this forum lolComment
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click the link, plug in your info, and it will tell you what power your scope should be set on to get the most accurate holdovers for your cartridge and bullet type, it will help explain things much betterComment
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If it were me, i would buy a scope with single crosshair and has adjustable windage and elevation turrets. learn the drops of your bullets at certain ranges. Then adjust elevation with your moa clicks. But, unless you can shoot no more than a 1 inch group at 100 yrds and practice at extended ranges to truly know your rifle, i wouldnt shoot further than 400-500 yrds max. The margin of error becomes way to much. The amount of drop in an average bullet between 600-700 yrds can be as much as 50 inches. My 270 is 41.3 inches of difference. A 308 dead on at 100 yrds has close to 360 inches of drop at 1000 yrds. Thats 30 feet!!!!!Last edited by DapperDan; 12-07-2012, 10:43 PM.Comment
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