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H4350 Burn Rate Change?

 
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  #8  
Old 09-18-2013, 10:37 PM
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Join Date: May 2011
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Re: H4350 Burn Rate Change?

Quote:
Originally Posted by bullfrog View Post
I have switched lots of H4350 with all other components identical with identical powder charge and blew primers. Had to pull the other bullets. I now back off and work up every time I change powder lots.
I've had the same experience. I now try to buy H4350 at least 16lbs at a time (2 8lb in the same lot).
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  #9  
Old 09-18-2013, 11:04 PM
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Location: Maple Valley, Washington
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Re: H4350 Burn Rate Change?

aggie99

The velocity change you got while dropping 1 grain of powder is pretty normal. I just cracked the seal on a new 8 lb jug of H4831SC and had to add 2 grains to get back the lost velocity. I canít think of a lot change Iíve made where there wasnít a change in burn rate.
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  #10  
Old 09-21-2013, 03:46 AM
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Re: H4350 Burn Rate Change?

When loading H4350 in the 30-06 with a 168gr bullet I have found:

With a 22" barrel I get the highest velocities with a 57.0gr load and slight lower velocity from a 58.0gr load.

From a 26" barrel the numbers are more what I would expect, I get the highest velocities from the 58.0gr load and slightly lower velocities from the 57.0gr load.

Accuracy with all 4 loads is very good.
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  #11  
Old 09-21-2013, 07:14 AM
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Re: H4350 Burn Rate Change?

ArchAngelCD
A 30-06 packs a slug of powder behind the bullets, which isn't burned at all in a short barrel until released at the muzzle.
This contributes to increased recoil, ES, reduced accuracy(compared to better designs), and as you found, adding more powder beyond burn reduces velocity -with a 30-06(not with most cartridges).
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  #12  
Old 09-21-2013, 11:32 AM
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Join Date: Sep 2008
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Re: H4350 Burn Rate Change?

Thanks too all for the food for thought. I am trying to find a second cronograph to check my results but since I am not seeing any pressure signs I think the load will be safe in my gun.
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  #13  
Old 09-21-2013, 10:06 PM
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Re: H4350 Burn Rate Change?

All I can say is WOW. I usually buy rl in 5# bottles, but I've been buying rl25 in #ers lately as the 5# jugs are higher per pound. I haven't noticed a bit of difference even with stuff that was packaged a couple of years apart. I don't buy enough H to know any better I guess, though it seems when I do buy it I'll but a 8#keg (to keep from getting ripped off locally) so I don't really have multiple lots to deal with.
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  #14  
Old 09-23-2013, 10:31 PM
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Re: H4350 Burn Rate Change?

58 grains of H4350 seems pretty consistent in my 06...24" barrel...2,862 fps average for 7 shots. ES was 18, SD was 7...and this was with Winchester brass.

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