|
Post by wesb81219 on May 10, 2016 19:58:35 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
|
|
|
Post by nfalls116 on May 10, 2016 20:12:58 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 which direction does the poi move?
|
|
|
Post by wesb81219 on May 10, 2016 20:36:38 GMT -5
It's been a little while since I shot it but I wanna say it would shoot high
|
|
|
Post by nfalls116 on May 10, 2016 20:42:20 GMT -5
It's been a little while since I shot it but I wanna say it would shoot high sounds to me like your point of aim is actually moving when you zoom as you can more clearly see it but there are people with much more knowledge on here than me as far as shooting goes
|
|
|
Post by wesb81219 on May 10, 2016 20:48:03 GMT -5
I read that if you zero scope at mid zoom then poi shouldn't change. I am actually sending the scope in for repair my cat knocked my rifle case over and when I tried to re bore sight it was way off and couldn't get the reticle to line up right so once I get it back I'll start from scratch and in the meantime hopefully I get some suggestions and do more research and figure it out
|
|
|
Post by nfalls116 on May 10, 2016 20:52:33 GMT -5
I read that if you zero scope at mid zoom then poi shouldn't change. I am actually sending the scope in for repair my cat knocked my rifle case over and when I tried to re bore sight it was way off and couldn't get the reticle to line up right so once I get it back I'll start from scratch and in the meantime hopefully I get some suggestions and do more research and figure it out it will probably shift but not as noticeably
|
|
|
Post by medic22 on May 10, 2016 21:44:17 GMT -5
Cheaper scopes are known to do this. Buy a better scope, or pick a magnification and stick to it.
|
|
|
Post by nfalls116 on May 10, 2016 21:45:52 GMT -5
I'd bet cheap scopes kill more animals
|
|
|
Post by medic22 on May 10, 2016 21:48:38 GMT -5
I'd bet cheap scopes kill more animals I bet they do. Not knocking someones choice in scopes, but he asked for the science behind why, there is the answer.
|
|
|
Post by lawrencecountyhunter on May 10, 2016 21:51:29 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.
|
|
|
Post by bullseye69 on May 10, 2016 21:51:36 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.
|
|
|
Post by nfalls116 on May 10, 2016 22:02:33 GMT -5
I'd bet cheap scopes kill more animals I bet they do. Not knocking someones choice in scopes, but he asked for the science behind why, there is the answer. I'm just giving you a hard time
|
|
|
Post by esshup on May 11, 2016 9:35:18 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. 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.
|
|
|
Post by medic22 on May 11, 2016 11:58:15 GMT -5
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. 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. That should be the case. The only thing that should change on a second focal plane is the substensions. For example, you zero your gun at 50 yards on 3x. That would make your first substension 100 yards. If you turn your scope up to 9x, your gun should still be zeroed at 50 yards, but your first substension is now 133yds. The zero should never change
|
|
|
Post by parson on May 11, 2016 11:59:17 GMT -5
I'd bet cheap scopes kill more animals If I was going to kill something with a scope..., I'd likely use a cheap one.
|
|
|
Post by nfalls116 on May 11, 2016 12:41:18 GMT -5
I'd bet cheap scopes kill more animals If I was going to kill something with a scope..., I'd likely use a cheap one. not so sure I wouldn't just find one with a no questions asked warranty
|
|
|
Post by wesb81219 on May 12, 2016 18:05:50 GMT -5
Well guys I appreciate it the info. I suppose I'll just zero at mid zoom and leave it. I probably won't need to make extremely long shots. All I've used the gun for so far is squirrel I may try to get a coon and possibly some coyotes with it. I want a coon skin hat and coyotes are just good to kill .
|
|
|
Post by bullseye69 on May 12, 2016 21:00:08 GMT -5
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. 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.
|
|
|
Post by nfalls116 on May 13, 2016 0:17:06 GMT -5
Yeah, I just thought my point of aim changed my point of impact because I could see the middle of the target instead of what I thought was the middle... But I've always shot using cheap scopes
|
|
|
Post by drs on May 13, 2016 5:04:05 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 Could be anything affecting your shooting. You mention your scope is a B.S.A brand which is one of many inexpensive scopes. Lots of times these cheaper scopes variable power scopes change P.O.I when you change magnification. Also it could be the brand of ammunition. You might try another brand of ammunition first then if there is no change, then buy a better quality of scope.
|
|