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how long do I need to let a barrel cool in between shots for a

 
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  #22  
Old 10-05-2013, 10:54 AM
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Re: how long do I need to let a barrel cool in between shots for a

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Originally Posted by Broz View Post
Every few rounds I would stray down the outside of the chamber. This spray is very cold and did cool the chamber metal. Not sure why, but after the match a friend told me all of my misses were the first shots after I strayed.
Jeff,

How long between shots after cooling? I'm curious if a barrel needs time to equalize the temperature change by say a few minutes to take advantage of the cooling and accuracy.
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  #23  
Old 10-05-2013, 12:04 PM
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Re: how long do I need to let a barrel cool in between shots for a

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Originally Posted by MMERSS View Post
Jeff,

How long between shots after cooling? I'm curious if a barrel needs time to equalize the temperature change by say a few minutes to take advantage of the cooling and accuracy.
On a big caliber when shooting drops or zero. I will shoot 1 or two and wait 10 minutes minimum. This greatly depends on ambient temp and sunshine. But if the bolt handle and the barrel feel the same I call it good.

Jeff
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  #24  
Old 10-05-2013, 12:33 PM
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Re: how long do I need to let a barrel cool in between shots for a

Let us throw this into the equation...

The way the barrel is made should impact cool down time. If a barrel is fluted, it provides more heat transfer area than a non fluted one and barrel coating would also impact cooling off. Any coating on the barrel surface changes the transfer time,
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  #25  
Old 10-05-2013, 12:42 PM
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Re: how long do I need to let a barrel cool in between shots for a

I am just starting final load work with my LRKM and testing powder stability. I took the rifle and ammo out and let it set in the cool morning temp of 44* for 1/2 hr. I then fired 3 rounds with the new loads from a cold rifle and cold ammo. 300 gr Berger OTM, 32" fluted Hart barrel , Sendero contour, full house load of N-570 in the 338 Terminator +P. Average velocity from the Magneto speed was 3210 fps. The first and 3rd shot were 3 fps apart.

Jeff
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  #26  
Old 10-05-2013, 01:12 PM
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Re: how long do I need to let a barrel cool in between shots for a

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Originally Posted by Broz View Post
I am just starting final load work with my LRKM and testing powder stability. I took the rifle and ammo out and let it set in the cool morning temp of 44* for 1/2 hr. I then fired 3 rounds with the new loads from a cold rifle and cold ammo. 300 gr Berger OTM, 32" fluted Hart barrel , Sendero contour, full house load of N-570 in the 338 Terminator +P. Average velocity from the Magneto speed was 3210 fps. The first and 3rd shot were 3 fps apart.

Jeff
I know we are talking barrel temps this thread but I'm interested to see how N-570 MVs at 64 and 24 deg compare to 3210. Your results look promising thus far.
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  #27  
Old 10-05-2013, 01:23 PM
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Re: how long do I need to let a barrel cool in between shots for a

Quote:
Originally Posted by MMERSS View Post
I know we are talking barrel temps this thread but I'm interested to see how N-570 MVs at 64 and 24 deg compare to 3210. Your results look promising thus far.
I set these to 905 yards just seeing for myself what cold barrel temp and powder stability will do to the rifle from one day to the next. I will continue testing but this all looked good. I should have final temp / velocity data in a week or so. Hope to get some 65* testing yet today.

As for cold barrel vs hot barrel at 905 yards, all 3 shots could have been covered with an orange. Like I said first shot to 3rd shot in a string with no cool time varied 3 fps on the chronograph.

Jeff
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  #28  
Old 10-05-2013, 01:29 PM
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Re: how long do I need to let a barrel cool in between shots for a

Doesn't the rapid cooling effect barrel wear. Being hot then rapidly cooling with Co2 or extremely cold air cause micro fractures in your barrel of receivers? Just thought I would ask. I know you can take red hot steel and dunk in cold water to make it stronger. Just wondering if that constant expanding then sudden contraction of barrels n receivers cause structural issues??
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