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Posted: 6/6/2011 6:09:00 AM EDT
| Working up a load for a Win. Model 70 in .30-06 and loads went from right side to the left as i increased powder. Never had this happen before usually vertical never horizontal. I shot three then ran a bore snake and let cool. Any thoughts? The last 4 loads did start to group. |
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Torque your action scews to 30 inch pounds if the stock isn't bedded, 60-65 inch pounds if it is.
Are you using front and rear bags? You need both for consistent bench shooting. Consistent cheek weld, trigger control, breathing and stock position on your shoulder are a requirement. So many things come into play it's almost impossible to analyze from afar. |
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If the barrel is touching the stock it will generally tend to string as it heats. First, shoot 5 shots with long intervals in between so the barrel can cool back to ambient or nearly so, then shoot two or three shots to warm the barrel, then a full magazine plus one in the chamber with a short interval between shots to really get it hot to see if this happens again.
If the gun shoots one or two shots into a small group without stringing, you're good to go if this is a hunting rifle. If the gun has a wood stock, it might change with the weather and let you down when you need the shot to count, too, so it's better to eliminate the stringing. I have a Contender Carbine that strings to 1 o'clock, and there's nothing to do except convert it to a pistol! I've tried everything else. But it's not an issue when I need to take one shot. |
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Quoted:
You don't state the distance or weather conditions. A cross wind would cause this behavior... the faster bullets would be less affected by the wind. Obviously, this effect would be more marked at higher wind speed/value and longer distances. +1 The barrel rubbing the stock would be my #2 most likely cause. |
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I assume you have a wood stock on your Winchester. If so,Horizontal stringing is a classical sigh of a warped stock contacting one side of the barrel. Winchesters and Remingtons from the 70s & 80s were notorious for this due to their use of a pressure point at the end of the barrel channel and poorly prepped/sealed stocks. If in time, the wood warps a little, it causes side pressure. To check for this, use a crisp dollar bill for a feeler gauge to see exactly where the stock is tight. If more contact on one side than the other, threr is the problem.
The solution is fairly simple, bed your receiver and releive the channel so the bbl is free floating. A second cause is shooter squeezing the trigger improperly or tightening his grip as he fires. MLG |
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