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Reloading Berger Bullets

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H4350 Burn Rate Change?

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  #8  
Unread 09-18-2013, 10:37 PM
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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  
    Unread 09-18-2013, 11:04 PM
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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  
    Unread 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  
    Unread 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  
    Unread 09-21-2013, 11:32 AM
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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  
    Unread 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  
    Unread 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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