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new build .300wm barrel legth?

 
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  #1  
Old 03-09-2013, 06:33 AM
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Join Date: Jul 2012
Location: Northern New Mexico
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new build .300wm barrel legth?

Im in the process of building a new rifle in .300wm but cant decide on the barrel legth. The barrel will be a brux standard palma contour and I will be shooting 200gr-240gr bullets. Im thinking Barrel legth between 26"-30". Keep in mind I would like to ring every drop of perfomance out of this cartridge but not sure if a 30 inch barrel is neccesary to do that. I no this has been discussed before in previous threads but any fresh perspectives would be greatly appreciated. Thanks
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  #2  
Old 03-09-2013, 08:59 AM
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Location: Michigan
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Re: new build .300wm barrel legth?

IMO you will get diminishing returns from the 300WM with barrel lenghts over 26". You should see some benefit but after 26" there just isn't enough case capacity to see huge gains. What bullet weights are you thinking?
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  #3  
Old 03-09-2013, 09:03 AM
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Re: new build .300wm barrel legth?

Quote:
Originally Posted by varmintH8R View Post
What bullet weights are you thinking?
I can read, I promise. I'm just dumb. With heavy pills like that a few extra inches of barrel might be a benefit with really slow powders. I've never done it, maybe someone will come through with some hands-on experience for you.
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  #4  
Old 03-09-2013, 05:09 PM
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Location: SW Colorado
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Re: new build .300wm barrel legth?

I have a few 300 win mags ranging from 24"-29.5" and I personally like a 28". I am actually in the process of building another with a Brux sendero contour finished at 28". With this barrel length with the 215 bergers I get 2910fps.

Mike
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  #5  
Old 03-10-2013, 12:51 PM
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Re: new build .300wm barrel legth?

Thanks for the input probably gonna go with a 28.
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  #6  
Old 03-10-2013, 02:09 PM
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Re: new build .300wm barrel legth?

Good choice! Keep us updated on the build and how she shoots

Mike
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  #7  
Old 03-10-2013, 02:49 PM
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Re: new build .300wm barrel legth?

I'm convinced one could go to 36 inches for any 30 caliber cartridge burning more than 70 grains of powder. I tested two .308 Win. barrel lengths, 22 inches and 32 inches, muzzle velocity went from 2800 fps to 3100 fps with the same M80 ball ammo I tested. In a 30" barrel, same load had a little over 3000 fps. All three had 4-grooves with about .3078 groove and .2990 bore diameters. The rounds had 41 grains of IMR4475 powder ('bout the same as IMR3031) under 147-gr. bullets.

I can imagine the big velocity increase from a .300 Win Mag barrel going from 24 to 30 inches with 70% more powder than a .308 Win. behind any bullet fired. There must be some reason why the 30 caliber magnums (including mine) used in 1000-yard prone matches had 28 to 30 inch barrels.
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