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Temperature

 
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  #1  
Old 05-05-2006, 07:13 AM
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Join Date: Apr 2006
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Temperature

What is the general feeling out there for the effect of barrel temperature on accuracy? I know that ammo temp is crucial, but what effects do barrel temp have on accuracy?

Also, how many fouling shots do you guys out there have to make in order to get the barrel to "settle down" before shooting groups?

thanks!
Rob
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  #2  
Old 05-05-2006, 04:31 PM
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Join Date: Dec 2005
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Re: Temperature

As long as the barrel's properly stress relieved after it's made, getting hot won't hurt accuracy. And the barrel tenon shoulder has to mate perfect with the receiver's face that's trued square with the chamber axis.

Several folks have shot test groups of 15 to 40 shots with one bullet going down range every 20 to 30 seconds. 600 yard accuracy is in the 2 to 3 inch range. At 1000 yards, accuracy is in the 5 to 6 inch range. Barrels shot this way really heat up.

In one type of highpower competition, teams of 6 people shoot service rifles at 600 yard targets. Using M1 Garands, each one will put 24 rounds down range in 50 seconds. Good rapid fire marksmen will put all of them inside 10 inches. And I as well as others have got burned touching the extremely hot barrel afterwords. These barrels are very accurate; it's the holding area on target that's kinda large.

Don't let a fresh round stay in the barrel more than about 15 seconds else its powder gets warmed up and the bullet will leave faster and strike higher. In shooting 1000 yard matches, I come down 1/4th MOA every 15 seconds after the first 15 to compensate for this. I've waited over two minutes doing this and still shot to call. Once I forgot to come back up to a normal elevation zero and put the next one a bit low!

If the bore's a bit on the rough side, you may need to shoot several shots to fill in those rough areas with bullet jacket material. Those unbalanced bullets won't shoot accurate. After the rough areas are filled, bullets fired afterwords will do just fine.
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  #3  
Old 05-05-2006, 06:02 PM
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Re: Temperature

most competitors like the barrel "fairly warm" to get the best accuracy.

most take at least one shot to foul the barrel. some take more. as already stated,a rough, factory barrel can take quite a few to achieve best accuracy. i have a factory 3006 that shoots better after 9-12 rounds have been fired out of it.
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