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A mystery to me, hope some of you can help.

 
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  #1  
Old 12-18-2002, 10:37 PM
308 308 is offline
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Join Date: Dec 2001
Location: Fl
Posts: 90
A mystery to me, hope some of you can help.

Have recently had the chance to air some of my stuff at 1000 yds.
Was impressed with my lowly 308 at a full grand. Shot less than moa groups, so I'm pleased. I know the 308 won't carry the ump for game at this distance but I'm learning with what I have so when I get a bigger gun I'll have some experience behind me, call it a long range learner gun if you will.
What I don't understand is the windage adjustments I'm having to make to hit center, at distance, starting with 3/4 moa at 400, with a pretty consistant, or even amount of increasing to 3.25 minutes at 1000 of left windage, this in basicly no wind conditions with wind flags outand may be noticeable at 200 and 300 also but we started at 400 the last two times we shot. I've leveled my scope with the weight hanging on the string trick and leveled the action with a level while mounting the scope and have it as level as I can get it. I don't mind having to make elevation and windage adjustments to hit but just don't understand the reason I'm having to. I have read the post about "law of repose" and this could be part of it but not all.I could be canting my rifle some but it's hard to beleive that I'm canting it consistantly the same from shot to shot and always in the same direction, cause once I make a windage adjustment it stays the same for that distance as long as the wind behaves.
I hope some of you can give me some answers or insight to what I'm seeing. Thank you Joey S AKA 308. sorry for being long winded
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Old 12-19-2002, 09:05 AM
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Join Date: Dec 2002
Location: Norway
Posts: 126
Re: A mystery to me, hope some of you can help.

Your rifle barrel wouldn't happen to have a right hand twist does it?
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  #3  
Old 12-19-2002, 09:21 AM
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Join Date: May 2001
Posts: 2,369
Re: A mystery to me, hope some of you can help.

Everyone loves a mystery!

Basics: Are you absolutely certain that your zero is centered vertically?

Canting can cause a problem.

"Spin Drift" or Yaw of Repose is an issue but I don't see this type "increasing windage" problem in the 308 Win rifles I shoot at 1000 yards.

What scope are you using? Could it be a problem with the erection system in the scope?

Do your other (I don't believe you have other's but) rifles exibit this same characteristic?

Have you shot with other folks on their rifles and experienced this same problem?

/r
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  #4  
Old 12-19-2002, 09:53 AM
*WyoWhisper*
 
Posts: n/a
Re: A mystery to me, hope some of you can help.

Here's a thought.. recoil starts just after ignition right??

I have noticed if I do not use a firm grip the rifles will cant during recoil..usually to the right ( right hand twist? ) If in fact you use a "soft" grip this rifle could be canting during recoil and in acuality be canted when the bullet leaves the barrel..????

Food for thought....
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Old 12-19-2002, 04:20 PM
308 308 is offline
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Join Date: Dec 2001
Location: Fl
Posts: 90
Re: A mystery to me, hope some of you can help.

The rifle wears a Leupold 6.5x20 w/the 30mm tube. It has a McMillan a2 or a3 stock. I'm shooting it off of a sinclair front rest and leather bag. It has a schneider no 8 contour barrel with 12 inch right hand twist. I'm shooting the 175 sierra match kings over 44 varget for a velocity of 2740 at ten feet over a pact chrono.
I'm not shooting it with a firm grip, holding the pistol grip lightly and squeezing the bag with my left hand, with minimal shoulder pressure and riding the recoil strait back.
I have some limited range time witha sendero in 7mm Rem Mag and it has shown a similar need for left windage but not as much as my 308 and I have not shot the 7 past 700.
I have it zeroed as near as I can get it at 100 and set my turret to zero.
I have the baer 2 piece bases with 20 mins of included angle and the burris signature 30 mm rings with the .010 insert under the back ring. My 100 yard zero is about 9 mins up from bottom in my scope so I have in the neighborhood of 60 mins I can go up.
No I have not had the opportunity to shoot someone elses rig at long range to see if it was a "me thang" instead of a gun thang.
I am going to put a scope level on it and see what changes that might make.
But even if I have to make two adjustments instead of one to get long range hits, What a blast that is. There would be no one hooked on drugs that ever got the chance to play this long range game. There is just something about the time lag from fireing to seeing and hearing the bullet make contact with steel way out yonder. thank you for your answers. 308
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  #6  
Old 12-19-2002, 05:34 PM
*WyoWhisper*
 
Posts: n/a
Re: A mystery to me, hope some of you can help.

I too shoot the A3 stock in my 308.. because the grip is nearly verticle.. try this..

grip the palm area fairly firm.. apply presure with your 2nd and third finger straight back into your shoulder. Don't use your pinky or you'll torque the rifle during recoil. I have a pretty good grip on mine and pull it pretty good into my shoulder... havn't had the left windage problem out to 700...
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  #7  
Old 12-21-2002, 02:25 PM
 
Posts: n/a
Re: A mystery to me, hope some of you can help.



[ 07-12-2003: Message edited by: S1 ]
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