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Sporter Barrels vs Heavy Barrels

 
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  #8  
Old 05-03-2010, 12:27 PM
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Re: Sporter Barrels vs Heavy Barrels

Easy fix---carry small cans of compressed air... Turn upside down and spray---cools in a few seconds..

Doing this for many years.
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  #9  
Old 05-03-2010, 12:40 PM
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Re: Sporter Barrels vs Heavy Barrels

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Originally Posted by Boss Hoss View Post
Easy fix---carry small cans of compressed air... Turn upside down and spray---cools in a few seconds..

Doing this for many years.
Thanks Boss, that's a good idea, and as I recall one of our members from AZ rigged up a CO2 cooling device which doen't result in a any condesation. Does the compressed air cause condesation?

Good input, but what I'm really after is folks opinions and experience on whether or not heavy barrels cool faster than light barrels? Any thoughts on that?
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Old 05-03-2010, 01:10 PM
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Re: Sporter Barrels vs Heavy Barrels

Just noticed this thread so I thought I would share what happened to me last summer . I was at our hunting club and dad had his sporter actually more of an in between sporter and heavy shiland barrel (22-250) . He had one of his green 100 count shell holders with him I say it was half full or just over anyways he turns to me and says shoot em up I'm going to reload some more for this gun that are more accurate . So I smiled and said okay sure (because I love to burn powder) I ran through all of these within 30 to 35 minutes to the best of my remebrance I never stopped the barrel was smokin hot I mean you could fry an egg on this sucker ! We'll today it wears a new barrel because evidentally I cooked it . I have always shot a heavy barrels on my RUM and what I notice is it takes longer to heat up but also takes longer to cool or (I'm just real impatient ) I always lean my gun up in a corner or on a tree with the bolt taken out so the air will travel up the barrel usually I can see mirage or heat waves comeing from the end of the barrel . It usually cools faster this way .

Hope I didn't stray to far off topic.

BigBuck
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Old 05-03-2010, 01:35 PM
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Re: Sporter Barrels vs Heavy Barrels

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Originally Posted by bigbuck View Post
Just noticed this thread so I thought I would share what happened to me last summer . I was at our hunting club and dad had his sporter actually more of an in between sporter and heavy shiland barrel (22-250) . He had one of his green 100 count shell holders with him I say it was half full or just over anyways he turns to me and says shoot em up I'm going to reload some more for this gun that are more accurate . So I smiled and said okay sure (because I love to burn powder) I ran through all of these within 30 to 35 minutes to the best of my remebrance I never stopped the barrel was smokin hot I mean you could fry an egg on this sucker ! We'll today it wears a new barrel because evidentally I cooked it . I have always shot a heavy barrels on my RUM and what I notice is it takes longer to heat up but also takes longer to cool or (I'm just real impatient ) I always lean my gun up in a corner or on a tree with the bolt taken out so the air will travel up the barrel usually I can see mirage or heat waves comeing from the end of the barrel . It usually cools faster this way .

Hope I didn't stray to far off topic.

BigBuck
I agree that if a heavy barrel gets to the same temp as a light barrel, it will take longer to cool because the heavy barrel has more heat energy because it has more mass. But to get the heavy barrel to the same temp requires more shooting (using the same load) Sooo... if we are shooting the SAME amount of rounds through them, the heavy barrel heats slower and cools faster because of greater surface area - same principle as radiators, base board heating and fluting. Am I missing something?
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Old 05-03-2010, 01:53 PM
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Re: Sporter Barrels vs Heavy Barrels

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Originally Posted by MontanaRifleman View Post
I agree that if a heavy barrel gets to the same temp as a light barrel, it will take longer to cool because the heavy barrel has more heat energy because it has more mass. But to get the heavy barrel to the same temp requires more shooting (using the same load) Sooo... if we are shooting the SAME amount of rounds through them, the heavy barrel heats slower and cools faster because of greater surface area - same principle as radiators, base board heating and fluting. Am I missing something?
I guess that if we shot the same amount of rounds then your right. I always would check it with my hand until I realized that the fatter barrel would be cool to the touch but that didn't mean that it was cool all the way through(or in my opinion) . so I would rush back to shooting my groups and wouldn't get the outcome that I was looking for so I took longer to let the barrel cool down. I wonder if anyone on this site has a temperature guage to see for sure ?


Good Thread looks like i'm going to learn some things.


Bigbuck
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Old 05-03-2010, 02:09 PM
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Re: Sporter Barrels vs Heavy Barrels

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Originally Posted by MontanaRifleman View Post
Thanks Boss, that's a good idea, and as I recall one of our members from AZ rigged up a CO2 cooling device which doen't result in a any condesation. Does the compressed air cause condesation?

Good input, but what I'm really after is folks opinions and experience on whether or not heavy barrels cool faster than light barrels? Any thoughts on that?

When you turn the can upside down it comes out as a liquid--around 100 below or so. Takes about 5 seconds to cool a tube to warm from hot.

Metal is metal the mass is the mass--the bigger tubes heat slower and cool slower.
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Last edited by Boss Hoss; 05-03-2010 at 04:54 PM.
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  #14  
Old 05-03-2010, 03:24 PM
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Re: Sporter Barrels vs Heavy Barrels

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Originally Posted by MontanaRifleman View Post
Good input, but what I'm really after is folks opinions and experience on whether or not heavy barrels cool faster than light barrels? Any thoughts on that?
Mark,
I'll give this a little more thought based on some simplified mathematical analysis. I can state right now that as barrel diameter increases, steel barrel volume/mass increases to the 2nd power of barrel diameter (a squared function). Whereas exterior barrel surface area only increases to the 1st power - in other words a direct 1:1 increase of surface area due to increasing barrel diameter. So increasing barrel diameter will increase the mass of steel in the barrel at a greater rate than it will increase exterior surface area.

I'll update this post when I have some more time on my hands. But I think the increased cooling rate is minimal. The greatest advantage, with respect to heat up and cool off the larger diameter barrel has over the smaller diameter barrel is the larger barrel will take more shots to reach an equal temperature during the initial shot string, because of the greater thermal mass (heat sink effect) of the extra steel in the heavier barrel. And for the initial repetitive-fire shot string, a barrel that heats up more slowly will be less prone to warp or shift points of impact, compared to the thin-walled tubes.

There are, of course, other advantages to the heavier barrel, such as the additional mass results in less shifting of POA during the firing process. It takes more force to initiate motion of the larger mass than the smaller mass. But you've focused on rates of heat-up, cool-off, and even more specifically, heavy barrel versus light barrel temperatures under steady, methodical, sustained rate of fire. I believe that is really what you've focused on. For a given, sustained rate of fire over extended periods of time (like 2 hours), will the heavier profile barrel reach a higher or lower temperature than a lighter profile barrel.

My current perspective is this: the benefit of the heavier barrel under such sustained fire is substantially less than the benefit of the slowed rate of heat-up during the first string of firing.

Last edited by phorwath; 05-03-2010 at 04:58 PM.
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