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Shooting Technique -- horizontal stringing

 
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  #1  
Old 10-26-2005, 12:04 PM
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Shooting Technique -- horizontal stringing

At lunch went out to do a little practice. Shot at 100yds and 200yds because the range max is 200. Used caldwell adjustable rest and rear bag. Shooting Tikka T3 SS Varmint in 308 Winchester. Federal Fusion 165's. I waited 3 minutes between shots. Wind directly from behind gusting between 3 to 10mph averaging around 4mph (so it seemed to me). 55F outside, elev 1067ft Western PA.

Results at 100yes. Max vertical measurement between 5 shots is about .52" - 0.308 = 0.212 off the caldwell at 100yes. Horizontallly, outside measurement is 1.375"-.3" = 1.067.

My rest is very steady. I'm leaning into it with slight downpressure on my cheek to get the crosshairs to come up about 1/2" to dead nuts center (DNC)at 100. Any reason why my horizontal stringing is so much larger than the vertical stringing--anything with technique that is easily diagnosed. Truthfully, I should have looked this up and done more research, but this is enough time screwing around on the web--so I have to get back to work.

Any experience or advice is appreciated. P.S. 200yd group off the bipod with the back supported by my fist is about a 3" group vertically and about 1.5" horizontally. Actually I find shooting off the bipod like this more comfortable than the caldwell and rear bag.

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Old 10-26-2005, 04:45 PM
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Re: Shooting Technique -- horizontal stringing

Matt,

Make sure your front bag on your Caldwell isn't too hard, this will cause vertical lots of times. They just need to be slightly firm, not hard or your rifle will bounce under recoil, but you won't notice it because it happens so fast. Also be consistent with your shoulder pressure.

Eddie Fosnaugh
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Old 10-27-2005, 08:48 AM
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Re: Shooting Technique -- horizontal stringing

Matt

I spent hours and hours searching this forum, 6mmBR, BR and another looking for the cures for horizontal grouping. There was someone who posted the same question about a month ago and all they got was advice on vertical grouping and comments about reading the wind.

About 5 months ago I bought my first front rest and rear rabbit ear bag. The groups suddenly went horizontal for the little light 17 Rem except for an occasional low one. I switched to a hotter primer and cured the occasional low one so that my groups are just like yours. Totally no vertical dispersion but wider than the Mississippi River!!! Conventional measurement said my groups went from 0.5 MOA to 1.0+MOA but it was all horizontal. That was when I began the search of the internet.

All I found was one passing comment by Speedy Gonzales on “alignment of the rear bag”. I checked and sure enough I never ever get mine lined up correctly. But I do not believe that can account for a full inch of horizontal at 100 yds.
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Old 10-27-2005, 10:40 AM
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Re: Shooting Technique -- horizontal stringing

After I posted that it occurred to me maybe I had been using the wrong words to Google. So I tried again.

Here is what Varmint Al has to say (although I do not understand why sandbags give one shape group and a front rest another.


TRIGGER CONTROL.... Ever wonder why benchrest shooters use triggers that have 2 ounce pulls, or less? Well, look at it this way. Let's assume the front of the rifle was fixed couldn't move. If while you were pulling the trigger, you just moved the rear of the rifle just 1/100th of an inch, you've just changed your POI about and 1.5 inches. JUST 1/00th OF AN INCH and you've just blown your group! So, it stands to reason, the more force you must exert on your trigger to release the sear, the more the rifle will move. I like to think of it this way. A two pound trigger requires half the force of a 4 pound trigger (32 oz Vs 64 oz). So, a 2 oz trigger requires 1/16th the force of a two pound trigger (2 oz vs. 32 oz)!
I can't tell you how many rifles have had amazing improvements in groups, just by changing to a competition trigger, or at least having it adjusted as low as you can get it. This is the first thing you should do to a rifle that you're expecting great things from. WARNING! Triggers are very touchy and sensitive mechanisms. If you are not sure what you are doing, have a gunsmith adjust your trigger and test it. <font color="red">
Now, test what your trigger pull is doing. You don't need ammo for this. I like to start with the gun cocked and the safety on just so you can see how much your crosshairs move when you pull on the trigger. Get set up like you're ready to shoot and aimed at the bull. Now squeeze the trigger, while keeping a very close eye on the bull and the crosshairs. Did the crosshairs move? Then expect it to move when you shoot for real. Now play around with different positions for your trigger hand and thumb. I'll bet you if you place your thumb on the side of the stock that you will get lateral movement when you pull the trigger. A better place to put your thumb is on top of the tang or not place it at all. Some benchrest shooters will place their thumb on the back of the trigger guard, and just squeeze thumb and trigger finger together to fire. </font> Whatever method you use, you should be able to exert enough force on your trigger be it 2 ounces or 2 pounds without causing the crosshairs to move on the bull. Practice this.
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  #5  
Old 10-27-2005, 01:09 PM
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Re: Shooting Technique -- horizontal stringing

I remember shooting a 6-round group with my 308 several years ago. On three of the shots I saw the reticle track straight back toward me,on the other three, the rife torqued and the scope went black. I got two distinct groups, each about .3 MOA but nearly an inch apart, all horizontal. A 308 has enough recoil to make consistent control of tht recoil critical to shooting little groups. I find that if I have any tension across the back of my neck and shoulders, I get horizontal stringing.

Rick
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Old 10-27-2005, 04:27 PM
JR JR is offline
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Re: Shooting Technique -- horizontal stringing

When shooting groups, try not to change your position behind the rifle much..If you have to sit out a gust, don't get up and have a sandwich inbetween..

"Wind directly from behind gusting between 3 to 10mph averaging around 4mph (so it seemed to me)."

Ha..but tailwind can be a bitch, you never know which way it switches..

Check your parallax is correct for the range as well..

JR
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Old 10-28-2005, 02:38 PM
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Re: Shooting Technique -- horizontal stringing

Thanks all,

Some things to think about and try. I'll definitely play with my thumb position and the front bag was pretty firm. I'll have to re-read and gameplan before I go out and practice next week. Again, thanks.
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