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Grouping question

 
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  #8  
Old 12-31-2009, 04:40 PM
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Re: Grouping question

I've never had a chance to look through a good 36x (or even 24x for that matter) rifle scope.

So are you confirming that the sight picture between a 9x and 14x could (in theory) be the difference I'm seeing...at least in part?
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  #9  
Old 12-31-2009, 04:57 PM
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Re: Grouping question

There could be 40-50 reasons for the difference. The only thing you tell us about is that the scope changed to one that I assume has parallax adjustment and that you are using it to some extent.

It can be different lot of powder, different ambient temperature at the range affecting either the cartridge or the stock. It could be simply less caffeine or the time spacing between rounds fired or the cleanliness of the barrel. Maybe you had on some thick coats and the recoil was not making you flinch so much.

None of us actually know!!! We are simply giving you some clues to follow up on based upon the one fact you supplied.
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  #10  
Old 12-31-2009, 05:10 PM
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Re: Grouping question

Thanks for the clues.

The old scope did not have a paralax adjustment and the new one does, so you make a good point on that one.

The other variables you mention were all virtually unchanged as far as I can recall.

I think my next step will be to go shoot again and see if I can repeat the smaller groups. If I can, then I'm leaning toward the paralax and sight picture (from higher mag) combination as the leading cause....and I'll gladly take that outcome.

If I can't reproduce the smaller groups, well, then maybe I just got lucky (or was particularly sharp) at my last outing to string together a few ~1/2" groups.

And point taken Bob...I know you certainly don't know for sure if I (the shooter) don't know. I appreciate the clues - they are good food for thought.
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  #11  
Old 12-31-2009, 08:36 PM
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Re: Grouping question

Sorry for the hijack...

But I have a question. I have a Zeiss 3.5-10x44 on my Sendero. Will longer shots be a problem because it does not have an adjustable objective ?
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  #12  
Old 12-31-2009, 11:44 PM
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Re: Grouping question

No problem on the highjack...this thread has pretty much run its course anyway.

You can test your scope at the ranges you are planning to shoot to see how much parallax exists.

This article on the basics may be helpful to you:

Parallax in Rifle Scopes

This thread goes into more detail (it has some good stuff in it):

The Optics Talk Forums - What exactly is parallax anyway?

Note the comments regarding the need for parallax adjustment beyond 9X (2/3 down in the thread). Seem to me that 10x is right on the edge of needing adjustment...depending on what you want to achieve (distance, accuracy, etc.).
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  #13  
Old 12-31-2009, 11:54 PM
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Re: Grouping question

The thing about the parallax may not be relevant when comparing those groups at 100 yards because even if the scope does not have parallax adjustment, 99.9% of them are set to be parallax free at 100 yards. 9x to 14x is a huge difference when you are trying to shoot the best groups at 100 yards so that is most likely the difference

and Tang yes that could be a problem, maybe not big enough to cause a miss on an animal at say 400 yards, but your groups won't be as small as they could be without parallax adjustment. Just put your crosshairs on a target several hundred yards out and move your head around and notice how much the reticle moves

Last edited by arthurj; 12-31-2009 at 11:59 PM.
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  #14  
Old 01-01-2010, 01:29 AM
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Re: Grouping question

Quote:
Originally Posted by arthurj View Post
The thing about the parallax may not be relevant when comparing those groups at 100 yards because even if the scope does not have parallax adjustment, 99.9% of them are set to be parallax free at 100 yards. 9x to 14x is a huge difference when you are trying to shoot the best groups at 100 yards so that is most likely the difference

and Tang yes that could be a problem, maybe not big enough to cause a miss on an animal at say 400 yards, but your groups won't be as small as they could be without parallax adjustment. Just put your crosshairs on a target several hundred yards out and move your head around and notice how much the reticle moves
I thought I was doing good with the Zeiss Conquest Target. I guess I should have stepped up to the 4.5-14. I do plan to take my RUM to a 1000 yard range. I know I wont win any contests, but its just for fun.
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