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Barrel length and powder burn rates?

 
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  #1  
Old 05-29-2009, 09:09 PM
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Barrel length and powder burn rates?

I will be reloading 300WM with H-1000 and 190gr bullet. Application is long range big game hunting. I'm currently shooting a 26" barrel but am considering going shorter...maybe down to 22".

However, I've read that with slower burning powder and heavier bullets you need to make sure your barrel is long enough to get complete combustion.

With the combination above and a 22" barrel am I at risk of incomplete combustion? Any advice on what length would be okay?

Thanks.
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  #2  
Old 05-29-2009, 09:33 PM
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Re: Barrel length and powder burn rates?

H-1000 is going to be way too slow for a 22" barrel. It's actually a bit slow for the 190 in a 300WM unless you have a super long barrel 30"+ and are loading compressed loads.

I haven't loaded for a short barrelled 300WM, but according to Quickload, a max load of H4350 will be 100% burnt in a 20.5" barrel behind a 190gr bullet. 22" barrel should work fine with h4350. Should be able to get around 2900fps with it.

AJ
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Old 05-29-2009, 10:20 PM
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Re: Barrel length and powder burn rates?

Quote:
Originally Posted by bookworm View Post
I will be reloading 300WM with H-1000 and 190gr bullet. Application is long range big game hunting. I'm currently shooting a 26" barrel but am considering going shorter...maybe down to 22".

However, I've read that with slower burning powder and heavier bullets you need to make sure your barrel is long enough to get complete combustion.

With the combination above and a 22" barrel am I at risk of incomplete combustion? Any advice on what length would be okay?

Thanks.
24'' barrel would be the minimum length in a 300 WM with any powder.

With a 22" barrel and H 1000 you will lose 100 to 150 ft/sec and gain a giant muzzle
flash. (Powder burning out side of the barrel),

I used to shoot a 300WM and it liked around 70 grs of H-4831 .

H 1000 appears to be at it's best at around 100grs of case capacity.

J E CUSTOM
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Old 05-29-2009, 10:41 PM
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Re: Barrel length and powder burn rates?

Keep the 26" barrel. If you go down to a 22" might as well go to the 30-06 while you are at it. Less powder for the same velocity.
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Old 05-30-2009, 11:36 AM
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Re: Barrel length and powder burn rates?

Thanks for the replies fellas.

AJ, I'm surprised to hear you say that H-1000 is too slow for 300 WM unless you have a very long barrel. The Hodgdon site lists 300 WM as a caliber for H-1000 on their site. There are also recipes and good results in the chat forums with this combination (althought barrel length was not discussed).

Having said all that, I have not cracked open the keg of the H-1000 yet, so maybe I should consider selling it and going with something slightly faster.

I originally had my eyes on the H4831.
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Old 05-30-2009, 11:54 AM
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Re: Barrel length and powder burn rates?

Quote:
Originally Posted by bookworm View Post
Thanks for the replies fellas.

AJ, I'm surprised to hear you say that H-1000 is too slow for 300 WM unless you have a very long barrel. The Hodgdon site lists 300 WM as a caliber for H-1000 on their site. There are also recipes and good results in the chat forums with this combination (althought barrel length was not discussed).

Having said all that, I have not cracked open the keg of the H-1000 yet, so maybe I should consider selling it and going with something slightly faster.

I originally had my eyes on the H4831.

H1000 will work with the 300WM, but not in short barrels or light bullets. 4831 is better for 300WM (especially for 180gr and up). But for lighter bullets and super short barrels (as you mentioned in your initial post), I'd use a faster powder. H-4831 will work and may work well, I think you'll get a little better velocity from your short barrel with H4350 though.

AJ
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  #7  
Old 05-30-2009, 12:09 PM
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Join Date: Dec 2008
Location: SW Idaho
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Re: Barrel length and powder burn rates?

Here is a bit of info from Hodgdon on the Chuck Hawks site:

.300 Win. Mag.

I know this is straying off topic a bit, but still related...Any thoughts on what a "reasonable" chamber pressure is for the 300WM rem 700?
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