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pros vs cons of extra long barrel 270 wsm

 
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Old 06-03-2014, 11:04 AM
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pros vs cons of extra long barrel 270 wsm

My idea is to put a 30in barrel on my wsm. I see how this can be tuff due to lack of printed data. I have people say as long as possible and a lot say 28in max.there must be advantages to both. Does anyone care to share there experience to educate me a little bit? I sort of understand the burn rate. It seams that the longer barrel with the right powder could give more accuracy. Any advice for me?
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Old 06-03-2014, 12:49 PM
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Re: pros vs cons of extra long barrel 270 wsm

What are you going to use it for?

Target only, sure 30"
Long range but you don't have to carry it to far, 28"
Spot and stalk or backpack hunting, 26". Maybe shorter.

Everything is a compromise. Longer can be more accurate with higher velocity but heavy.
Medium 26-28, lighter and you give up ~50fps
Shorter, could give up speed and maybe accuracy but will be lighter.

I went 28 on my 300wsm. Sendoro profile. Heavy as 12lb+ but it shoots.
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Old 06-03-2014, 12:58 PM
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Re: pros vs cons of extra long barrel 270 wsm

There is a practical length that you reach with any barrel, (Velocity, Accuracy, and manageability.

That being said, there is a point of diminishing returns. After an optimum length is reached (The length that the velocity per/inch of barrel starts to decrease adding more inches does not add much velocity and at some point depending on the barrel contour may/can start effecting accuracy due to the harmonics.

The 270 wsm can certainly use a 28" barrel and benefit some from a 30". beyond that the increases in velocity will taper off.

The main advantage you will see is when shooting heavy bullets. the longer barrel will allow the slower powder to completely burn as long as you use the right primer.

As far as accuracy Shorter barrels are normally more accurate because the harmonics are better and the barrel is stiff. The longer barrels have more whip unless they are the heavy tapers, contours.

Dan Lilja did a test on maximum barrel length and started with a 46" barrel and cut 2'' inches off
between each test.

Lilja Precision Rifle Barrels - Articles: Barrel Lenghts and Velocities in the 338/378 Weatherby Magnum

Hope this helped

J E CUSTOM
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Old 06-03-2014, 01:30 PM
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Re: pros vs cons of extra long barrel 270 wsm

My 7wsm has a heavy 30" barrel. I'm getting rather high velocities with a light powder charge. 67grns. H-1000, 162 amax, 3025 fps. I also have a "match" chamber. The only thing that sucks is I had to buy a longer cleaning rod.
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Old 06-03-2014, 04:30 PM
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Re: pros vs cons of extra long barrel 270 wsm

Thanks J E Custom. I'm a bit limited on this project. I have a heavy bull 30in barrel I will use. I intend on using a tight neck with a little through. I really like the 135 match kings but I think I will need a heavier bullet for 1000yd. I have heard nothing but good about matrix vlds. I'm just starting to select a load for this rifle. Any thoughts?
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Old 06-03-2014, 04:39 PM
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Join Date: Mar 2014
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Re: pros vs cons of extra long barrel 270 wsm

Thanks J E Custom. I'm a bit limited on this project. I have a heavy bull 30in barrel I will use. I intend on using a tight neck with a little througt. I really like the 135 match kings but I think I will need a heavier bullet for 1000yd. I have heard nothing but good about matrix vlds. I'm just starting to select a load for this rifle. Any thoughts?
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  #7  
Old 06-03-2014, 04:45 PM
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Re: pros vs cons of extra long barrel 270 wsm

Thanks Chrishatley. If you don't mind my asking. What kind of range and accuracy are you getting out of your 7? A while ago I made the mistake of shooting my buried rifle at 1000yds. Boy did I get bit! What a learning curve. Thanks for your comments.
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