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#6963763 - 11/17/17 10:34 AM Question for the experts!!
Chunky Dunk Offline
Pro Tracker

Registered: 05/28/15
Posts: 1193
Loc: Rockport
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.....
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#6963769 - 11/17/17 10:38 AM Re: Question for the experts!! [Re: Chunky Dunk]
ChadTRG42 Offline
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Registered: 09/16/09
Posts: 11616
Loc: Lewisville, TX
Dial 6" right, and call it good!
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#6963776 - 11/17/17 10:45 AM Re: Question for the experts!! [Re: Chunky Dunk]
FiremanJG Online   content
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Registered: 12/16/08
Posts: 22046
Loc: Wolfe City, TX
You check 100 yard zero again, after the 200 yard shots?
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#6963781 - 11/17/17 10:49 AM Re: Question for the experts!! [Re: FiremanJG]
Chunky Dunk Offline
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Registered: 05/28/15
Posts: 1193
Loc: Rockport
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.
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#6963783 - 11/17/17 10:50 AM Re: Question for the experts!! [Re: ChadTRG42]
Chunky Dunk Offline
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Registered: 05/28/15
Posts: 1193
Loc: Rockport
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.
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#6963820 - 11/17/17 11:30 AM Re: Question for the experts!! [Re: Chunky Dunk]
Texasteach Offline
Woodsman

Registered: 01/05/16
Posts: 182
Loc: Ector County
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.


Edited by Texasteach (11/17/17 11:32 AM)
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#6963996 - 11/17/17 02:05 PM Re: Question for the experts!! [Re: Texasteach]
spg Offline
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Registered: 08/11/13
Posts: 1420
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.

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#6964185 - 11/17/17 05:16 PM Re: Question for the experts!! [Re: spg]
colt45 Offline
THF Trophy Hunter

Registered: 08/19/06
Posts: 7440
Loc: bastrop county
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
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#6964320 - 11/17/17 07:33 PM Re: Question for the experts!! [Re: Chunky Dunk]
furfinrfeather Offline
Bird Dog

Registered: 09/17/09
Posts: 271
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.

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#6964351 - 11/17/17 07:54 PM Re: Question for the experts!! [Re: furfinrfeather]
HCHunter28 Offline
Bird Dog

Registered: 12/10/16
Posts: 303
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.

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#6964568 - 11/18/17 06:13 AM Re: Question for the experts!! [Re: HCHunter28]
Texasteach Offline
Woodsman

Registered: 01/05/16
Posts: 182
Loc: Ector County
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...


Edited by Texasteach (11/18/17 07:03 AM)
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#6964617 - 11/18/17 07:45 AM Re: Question for the experts!! [Re: Chunky Dunk]
P_102 Online   content
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Registered: 09/23/08
Posts: 1014
Loc: Grapevine
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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#6964622 - 11/18/17 07:51 AM Re: Question for the experts!! [Re: Chunky Dunk]
Texasteach Offline
Woodsman

Registered: 01/05/16
Posts: 182
Loc: Ector County
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.
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#6964629 - 11/18/17 08:00 AM Re: Question for the experts!! [Re: Texasteach]
HCHunter28 Offline
Bird Dog

Registered: 12/10/16
Posts: 303
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.


Edited by HCHunter28 (11/18/17 08:06 AM)

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#6964631 - 11/18/17 08:02 AM Re: Question for the experts!! [Re: Chunky Dunk]
P_102 Online   content
Pro Tracker

Registered: 09/23/08
Posts: 1014
Loc: Grapevine
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

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