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Post by esshup on May 13, 2016 22:17:26 GMT -5
Can you go into more detail? I thought that if the shooting distance is the same, it shouldn't matter what power the scope was set on, the zero should always be zero. The only difference would be shooter error due to not being to aim as precise on a low power vs. a high power. I can't really go into detail but give it a try. Zero your scope at 100 yards at one power say the lowest setting,shoot a 3 shot group, then crank it up all the way and shoot a three shot group, and you will see you pio has changed. Now maybe on a 3-9 power scope it might not seem to move much but a 4-20 will move a lot. I'll check it this upcoming week on my 5.5-22 power. Remind me on Thurs or Friday, M-W I will be running from sunrise to well after dark.
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Post by trapperdave on May 14, 2016 7:05:30 GMT -5
If mere!y nocking your rifle over causes that...I'd buy a different scope. That one is junk.
I'm NOT believer in needing expensive optics. If had cheap Bushnell's under $100 hold zero thru years of abuse on trap lines and coon and squirrel hunting.
Long range center fires I'd spend more, but at rimfire ranges...not needed
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Post by esshup on May 14, 2016 10:25:27 GMT -5
If mere!y nocking your rifle over causes that...I'd buy a different scope. That one is junk. I'm NOT believer in needing expensive optics. If had cheap Bushnell's under $100 hold zero thru years of abuse on trap lines and coon and squirrel hunting. Long range center fires I'd spend more, but at rimfire ranges...not needed I agree. The scope shouldn't change zero with any power adjustment or with any bumps. I don't care whether it's a $50 or $2,000.00 scope. I have inexpensive scopes hold zero and have dropped a scoped slug gun from 10' up a tree and it still was zero'd (burris scope). Later on this coming week I will test 2 scopes that are what could be considered both ends of the $$ range and see if they change zero from lowest power to highest power. Simmons 44 Mag and a Nightforce NSX
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Post by wesb81219 on May 21, 2016 20:00:40 GMT -5
Got my scope back from bsa they said it checks out good and re zeroed. Have it back on the gun and dialed in at 50 yds on 6x zoom. Next time I shoot, probably tomorrow I'll play with the zoom and see what I get
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Post by wesb81219 on May 22, 2016 15:45:12 GMT -5
Well I tried my scope out from 6x-12x zoom and everything is on the dot. Looks like it's good to go. Shot the little red cap off of an empty spray can on the 2nd shot.
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Post by jackryan on May 22, 2016 20:27:12 GMT -5
The gun is shooting high at the same distance you zeroed, correct? You're only changing the magnification, not the yardage? Because if you zero close, say 25 yards, then shoot at 100 a flat shooting rifle will hit high. This is because a rifle zeroed at 100, 200, etc. will hit a couple inches low at close range due to the scope sitting 2-3 inches above the bore. If the POA is actually changing as magnification changes, you may be able to correct it by adjusting the parallax. Adjust the knob (if equipped - I would think there would be a parallax adjustment on a 12x) to the correct setting/range and zero at maximum magnification. As for the scope being bumped off that much from tipping over, that's to be somewhat expected with cheap scopes. I have a few myself, you just have to be extra careful because they can be finicky. For the record, I'm by no means an expert, I've just learned a few things through trial and error. Yes this above, sort of. Most any variable power scope with more than 9x is going to have a parallax issue and an adjustment ring to compensate for it. Expensive or cheap doesn't matter a bit. Parallax is a result of basic physics. Expensive or cheap difference shows up when you look at the label on the parallax adjustment ring. Cheap scopes are rarely very accurate in their labeling for the correct parallax adjustment. You adjust a scope for correct parallax unloading the gun, turn the power ring to infinity. Then look at the sky as if you are aiming at a bird and turn the eye adjustment ring, nearest to your eye, until the cross hairs are sharp. Put the scope down for a few minutes and repeat. You need to repeat this until the cross hairs are sharp as soon as you put it to your eye. Your eye begins to compensate soon as you look through it, this is why it may take a few trys to get it correct. Now you set the gun on a steady rest, aimed at a known distance, 100 yards is good. Turn to the highest magnification. With out touching the gun, look through the scope at the target. Does it move around on the target as you try to hold still looking through the scope? If so, the parallax is incorrectly adjusted. Get some white out to remark the adjustment ring correctly or at least closer. Sit down behind the gun like you are going to shoot, then move your head slightly left, right, up, down, if the X moves off the bull then adjust the parallax ring until it doesn't. Use a white out dot to mark it true. This is where less expensive, costs you. GENERALLY they don't repeat as well on this adjustment. If I'm really on something small, squirrel heads, a long way off, I'll double check this every time I change distance. But the dot you set at the range will get you closer than the factory setting. You'll need to test this at several ranges you commonly shoot to for optimal accuracy. The higher the power of scope, the more this is an issue. Most 9x and under it is not an issue so they don't even have the option to adjust it.
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Post by moose1am on May 26, 2016 18:41:14 GMT -5
I have a marlin 17hmr with a bsa 4-12 x40 scope. I have noticed after zeroing the scope on the lowest magnification when I zoom in it shoots off target. any suggestions or facts to why this is? I have read that it shouldn't matter what zoom you use after zeroing and have read that poi changes with zoom. So I'm lost thanks for any help or info If its a second focal plane scope the POI will change. Zero it on the magnification you will use it the most at. Then change the magnification and write down where it ends up that way you will know. If you have a first focal plane scope it won't change the POI no mater what magnification its on. bingo give this man a prize. He had the correct answer. First Focal Plane scopes are the best. They don't change POI as you change the magnification. Less expensive 2nd focal plane scopes can be calibrated to shoot at various ranges and magnifications. Nikon Scope have a computer program you can down load and use to make a cheat card. Basically with the 2nd focal plane scopes you dial in the scope at the max magnification and then keep it there to shoot. If you change the magnification on these 2nd focal plane scopes the POA and the POI will change. Even if you have a parallex adjustment know (Objective focusing). The Nikon P223 Scope that I use is a 2nd focal plane scope and the targets size changes as you zoom in and out. Relative to the reticle.
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Post by sakorifle on May 27, 2016 9:45:20 GMT -5
Greetings After a lot of scopes i can tell you with authority the zero cross hairs should not change regardless if it is first focal plain or second focal plain. Second focal plain only the subdivisions will change not the cross hairs.
Also with optics the rule is you get what you pay for, in a scope you are paying for the insides that you are not able to see, and repeatability. regards Billy
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Post by omegahunter on Jun 2, 2016 8:35:54 GMT -5
Most scope manuals (I know, "What are those?") will tell you to sight in using the highest magnification as long as it does not create parallax. If I am shooting at 50 yards, 6 or 7 power is the highest I will go without a parallax adjustable scope. At 100, I use the highest power setting.
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Post by esshup on Jun 3, 2016 18:21:04 GMT -5
Most scope manuals (I know, "What are those?") will tell you to sight in using the highest magnification as long as it does not create parallax. If I am shooting at 50 yards, 6 or 7 power is the highest I will go without a parallax adjustable scope. At 100, I use the highest power setting. I think they do that because the more magnification, the more accurately you can place the crosshairs on the target. I DID the test with the 2 scopes. Neither changed zero from lowest magnification to highest magnification. Test was at 100 yds. Both have parallax adjustments. Adjusted at highest setting and not touched for the test. If the scope changes zero with a power adjustment it's a POS and needs to be disposed of.
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Post by bullseye69 on Jun 3, 2016 18:52:39 GMT -5
Most scope manuals (I know, "What are those?") will tell you to sight in using the highest magnification as long as it does not create parallax. If I am shooting at 50 yards, 6 or 7 power is the highest I will go without a parallax adjustable scope. At 100, I use the highest power setting. I think they do that because the more magnification, the more accurately you can place the crosshairs on the target. I DID the test with the 2 scopes. Neither changed zero from lowest magnification to highest magnification. Test was at 100 yds. Both have parallax adjustments. Adjusted at highest setting and not touched for the test. If the scope changes zero with a power adjustment it's a POS and needs to be disposed of. Must be the cheap scopes I use.
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Post by esshup on Jun 3, 2016 23:09:57 GMT -5
I think they do that because the more magnification, the more accurately you can place the crosshairs on the target. I DID the test with the 2 scopes. Neither changed zero from lowest magnification to highest magnification. Test was at 100 yds. Both have parallax adjustments. Adjusted at highest setting and not touched for the test. If the scope changes zero with a power adjustment it's a POS and needs to be disposed of. Must be the cheap scopes I use. The one scope that I tried was a Simmons 44Mag. Pretty inexpensive. I think I have a Barska or a Cat-Eye scope laying around if you want to try that. The other one was the Nightforce NSX 5.5-22x50 NPR-1 reticle with zero stop. We're talking zero with the center of the crosshairs. Next time I'm over I will bring my portable bench, stool and rest.
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Post by dbd870 on Jun 4, 2016 4:38:27 GMT -5
Simmons/Barska and Nightforce talk about both ends of the spectrum!
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Post by esshup on Jun 4, 2016 11:26:27 GMT -5
Simmons/Barska and Nightforce talk about both ends of the spectrum! I believe in equal opportunity, but I don't believe in giving special treatment. If it works for the intended job, all well and good. If it doesn't (and moving POI isn't considered "working" in my vocabulary) then it gets a boot in the butt. I wouldn't put a Nightforce on a small game rifle that wouldn't be shot more than 75 yds, and I wouldn't put a Barska on a long range rifle where I expect it to work at 1/2 mile or further.
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