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Mar 25th, 2012
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Question for the experts!! #6963763
11/17/17 04:34 PM
11/17/17 04:34 PM
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Chunky Dunk Offline OP
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I have an older model Remington 700 in 7mm express, or 280. Rifle has always been a shooter. Well I swapped to a new scope (Vortex Viper) for more magnification and better quality. Actually bore scrubbed my barrel last night, cleaned the entire rifle, the whole 9 yards. Bore sighted the new scope, used older Leopold 1 piece base, and rings.

Took it to the range with factory Hornandy 139grn SST's, shot 4 to get it zeroed, and then shot 4 that were all touching! group was at 1" high and 1/2" to the right of bulls eye. Moved out to 200 yards, and 6 shots, all went left 7"'s.....What the heck? I had switched to another box of factory ammo, same ammo just different lot #. So I tried a couple from the first box, and they were still at least 5" left.....

Wind was 5 mph or less and at my back almost directly. What is going on? First time I have ever had this happen. Thoughts from the brain trust, please.....

Re: Question for the experts!! [Re: Chunky Dunk] #6963769
11/17/17 04:38 PM
11/17/17 04:38 PM
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Lewisville, TX
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Dial 6" right, and call it good!



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Re: Question for the experts!! [Re: Chunky Dunk] #6963776
11/17/17 04:45 PM
11/17/17 04:45 PM
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Wolfe City, TX
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FiremanJG Online content
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You check 100 yard zero again, after the 200 yard shots?



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Re: Question for the experts!! [Re: FiremanJG] #6963781
11/17/17 04:49 PM
11/17/17 04:49 PM
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Rockport
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No I ran out of targets LOL. I am heading out now to get some more. Range was filling up fast with all the weekend warriors so I will probably wait and go back tomorrow morning at day break.

I was thinking the same thing though, zero at 200 and see what it does at 100 after that.

Re: Question for the experts!! [Re: ChadTRG42] #6963783
11/17/17 04:50 PM
11/17/17 04:50 PM
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Originally Posted By: ChadTRG42
Dial 6" right, and call it good!


LOL I suspect that is what I will have to do. I am going on a muley hunt in Mexico in Jan, and I just wanted to take this old rifle, it has always served me well.

Re: Question for the experts!! [Re: Chunky Dunk] #6963820
11/17/17 05:30 PM
11/17/17 05:30 PM
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Ector County
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Texasteach Offline
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If you have the base with the windage screws, chunk it for solid bases/rings. If you don't want to chunk it, sounds like you may not have the base/ring with the windage screw centered. (Especially if your 100 yard zero is still where it is suppose to be). In other words, with the adjustable base, make sure the rings are concentric to the alignment of the bore. Otherwise, the further from the bore you get, the more off it will be.

Last edited by Texasteach; 11/17/17 05:32 PM.

You did what?
Re: Question for the experts!! [Re: Texasteach] #6963996
11/17/17 08:05 PM
11/17/17 08:05 PM
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Originally Posted By: Texasteach
If you have the base with the windage screws, chunk it for solid bases/rings. If you don't want to chunk it, sounds like you may not have the base/ring with the windage screw centered. (Especially if your 100 yard zero is still where it is suppose to be). In other words, with the adjustable base, make sure the rings are concentric to the alignment of the bore. Otherwise, the further from the bore you get, the more off it will be.


^^^^^^^^What he said or the scope is mounted with a cant.

Re: Question for the experts!! [Re: spg] #6964185
11/17/17 11:16 PM
11/17/17 11:16 PM
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bastrop county
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Originally Posted By: spg
Originally Posted By: Texasteach
If you have the base with the windage screws, chunk it for solid bases/rings. If you don't want to chunk it, sounds like you may not have the base/ring with the windage screw centered. (Especially if your 100 yard zero is still where it is suppose to be). In other words, with the adjustable base, make sure the rings are concentric to the alignment of the bore. Otherwise, the further from the bore you get, the more off it will be.


^^^^^^^^What he said or the scope is mounted with a cant.
up


hold on Newt, we got a runaway
Re: Question for the experts!! [Re: Chunky Dunk] #6964320
11/18/17 01:33 AM
11/18/17 01:33 AM
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Heck, if it won't shoot, let me have it and I'll put it next to my 7mm express. I'm will still out shoot me.

Re: Question for the experts!! [Re: furfinrfeather] #6964351
11/18/17 01:54 AM
11/18/17 01:54 AM
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HCHunter28 Offline
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It sounds like something is loose to me. Off centered windage screws wouldn't cause a hook shot like that. Off centered windage screws would effect being on paper at first but once zeroed it should stay true.

Re: Question for the experts!! [Re: HCHunter28] #6964568
11/18/17 12:13 PM
11/18/17 12:13 PM
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Texasteach Offline
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Originally Posted By: HCHunter28
It sounds like something is loose to me. Off centered windage screws wouldn't cause a hook shot like that. Off centered windage screws would effect being on paper at first but once zeroed it should stay true.


Someone needs to retake Geometry. Two lines on a plane are forced to intersect at 100 yards due to the adjustments on the scope. Unless those two lines are perfectly parallel, that intersection will be the last point of intersection into perpetuity.

Shaking my head...

Last edited by Texasteach; 11/18/17 01:03 PM.

You did what?
Re: Question for the experts!! [Re: Chunky Dunk] #6964617
11/18/17 01:45 PM
11/18/17 01:45 PM
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Geometry doesn't explain why it shot to the right at 100 then switched to the left at 200. I'd guess the base as said above, at last springs Hunters Challenge the same thing happened to one of the shooters, Chad diagnosed the problem and helped him fix it.

P_102


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Re: Question for the experts!! [Re: Chunky Dunk] #6964622
11/18/17 01:51 PM
11/18/17 01:51 PM
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Ector County
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Geometry absolutely does. It didn't "switch right". It continues on a straight path. If you can't understand that concept, then don't volunteer an answer.


You did what?
Re: Question for the experts!! [Re: Texasteach] #6964629
11/18/17 02:00 PM
11/18/17 02:00 PM
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Originally Posted By: Texasteach
Originally Posted By: HCHunter28
It sounds like something is loose to me. Off centered windage screws wouldn't cause a hook shot like that. Off centered windage screws would effect being on paper at first but once zeroed it should stay true.


Someone needs to retake Geometry. Two lines on a plane are forced to intersect at 100 yards due to the adjustments on the scope. Unless those two lines are perfectly parallel, that intersection will be the last point of intersection into perpetuity.

Shaking my head...


There is not a line on a scope because there is a single reticle in the scope. The scope body has nothing to do with it. Tilting the scope does nothing except for mess with adjustment. Explain why a 0 Moa vs 20 Moa scope base doesn't cause this same thing.

If I use a 0 moa base and I zero at 200, I'm 1-1.5 inches high at 100. If I use a 20 Moa base, after zeroed I get the same result. Scopes tilted differently but how do I get the same result?

Texasteach...maybe you should stop teaching texas the wrong things.

Last edited by HCHunter28; 11/18/17 02:06 PM.
Re: Question for the experts!! [Re: Chunky Dunk] #6964631
11/18/17 02:02 PM
11/18/17 02:02 PM
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First off, I never said "switch right".. The rifle shot 1/2" to the right at 100, a straight path puts it 1" right at 200....but it shot left. P_102



Do not trifle in the affairs of dragons, for thou art crunchy and taste good with ketchup.
Re: Question for the experts!! [Re: Chunky Dunk] #6964821
11/18/17 05:14 PM
11/18/17 05:14 PM
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Wise Co.
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I once had a Bushmaster AR that treated me badly. If I sighted in at 50, it would be off to the left at 100. If I sighted in at 100, it would be off to the right at 50. I sent it to BM and it came back good. I believe the problem was that the barrel was not in lateral alignment with the receiver.




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Re: Question for the experts!! [Re: Chunky Dunk] #6964825
11/18/17 05:16 PM
11/18/17 05:16 PM
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Hill Country of Texas
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My money is with TT on this. The scopes line of sight is not in same plane as the bore. Have to adjust rear windage screws until in same plane as bore or problem will remain.

Re: Question for the experts!! [Re: Chunky Dunk] #6965199
11/19/17 12:17 AM
11/19/17 12:17 AM
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Busheler would know the answer !!!


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Re: Question for the experts!! [Re: blackcoal] #6965204
11/19/17 12:19 AM
11/19/17 12:19 AM
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Any update from the op?


Hint...........

Re: Question for the experts!! [Re: Chunky Dunk] #6965457
11/19/17 06:03 AM
11/19/17 06:03 AM
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Rockport
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Remounted the scope today, after shooting again this morning. Zero'd at 200, 3.5 inches to the left. I am seriously thinking something is not right in the scope. Don't have any other 30 MM scopes freed up now or I would try that.

Took scope and rings off, I scribed the centerline of the 1 piece mount, and did some measuring, I don't think it was mounted off center enough to cause it to move that far left at 200. Anyway took everything off, cleaned and checked mount and rings. Remounted and torqued all fastners. It is about as centered as you can get it with out using a jig. I will be changing the scope mounts after this season.

FWIW, the scope that came off, has been on this rifle for 8 years, and never had to move it ever! Just wanted more magnification for the upcoming hunt. Seriously thinking about putting the old scope back on and going with what I know works.

Don't know if I will get to shoot tomorrow or not, but I will post results when I do get to shoot again.

Re: Question for the experts!! [Re: Chunky Dunk] #6965556
11/19/17 02:11 PM
11/19/17 02:11 PM
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Check for scope parallax. That would be my best educated guess and can cause exactly what you describe.


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Re: Question for the experts!! [Re: Chunky Dunk] #6965734
11/19/17 05:35 PM
11/19/17 05:35 PM
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Definitely use the scope that has proven reliable for now. Mess with the other after the season.

There are no good new ideas right before a match or a hunt.


Professionally trained and certified pistol and license to carry instructor.
Re: Question for the experts!! [Re: jeffbird] #6965746
11/19/17 06:02 PM
11/19/17 06:02 PM
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Originally Posted By: jeffbird
Definitely use the scope that has proven reliable for now. Mess with the other after the season.

There are no good new ideas right before a match or a hunt.


Best advice on he thread, it worked for years it can work for a couple more months

Re: Question for the experts!! [Re: kmon1] #6965790
11/19/17 07:31 PM
11/19/17 07:31 PM
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Wolfe City, TX
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Originally Posted By: kmon1
Originally Posted By: jeffbird
Definitely use the scope that has proven reliable for now. Mess with the other after the season.

There are no good new ideas right before a match or a hunt.


Best advice on he thread, it worked for years it can work for a couple more months


Yup, yup.



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Re: Question for the experts!! [Re: Chunky Dunk] #6965876
11/19/17 10:15 PM
11/19/17 10:15 PM
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Austin County
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When you have time to play with it, put the scope's windage right in the middle.You can do that by going all the way one way and then count how many clicks it takes to bottom out the other way, then go half way back. After you do that, align the point of aim to the point of impact by adjusting the screws on the Leopold base, not using the scope adjustments, and see if that corrects your problem.

Last edited by hermano W; 11/19/17 10:15 PM.
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