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Ultra Mag Powders and Barrel Life

 
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  #1  
Old 11-13-2009, 02:05 PM
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Ultra Mag Powders and Barrel Life

I dug up an old (4 yrs) thread on this subject and wondered if anyone might have some experience or anything to add.

Barrel wear with 7mmRUM

In the article, Kirby says he believes the large overbores can get improved barrel life by switching from the stick powders to the newer ball powders which he believes are fairly temp stable and will burn "clean" at higher pressures. These include Ramshot Magnum and AA8700. He says these powders dont burn as "hot" as the stick powders.

Kirby, sorry to take your name in vain, but I find this a fascinating subject, especially scince I have a 300 RUM and am considering a 7.

Anyway, was wondering if anyone else has any experience and insight with this that they could share on the subject. Any one using these powders in their Ultra's?

Mark
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Old 11-13-2009, 03:04 PM
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Re: Ultra Mag Powders and Barrel Life

I spoke with the folks at sierra asking about data for the 6-284 and they said that was the case.
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Old 11-13-2009, 04:00 PM
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Re: Ultra Mag Powders and Barrel Life

I had read recently that US869 was an "extremely cool burning" powder but can not for the life of me remember the source so take it with a grain of salt. It certainly makes sense to me that if two powders shot the same number of rounds in the same amount of time and the barrel was cooler with one vs the other the barrels life would likely be affected adversely by the hotter powder. That is something you could easily verify yourself at the range.
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Old 11-13-2009, 04:18 PM
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Re: Ultra Mag Powders and Barrel Life

I had a 300 rum with a 30" barrel and put 2500 rounds through it (still good) I shot primarily H870 which is no longer available from Hodgedon. This powder would produce 100 fps more velocity than ANYTHING else! You can still get T870 from Thunderbird Cartridge in Az. It is identical to the old H870 (military surplus) and I would highly recommend it.......Rich
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Old 11-13-2009, 05:31 PM
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Re: Ultra Mag Powders and Barrel Life

I have more rounds than I should have through a 270 AM barrel. Most w/US 869 couple of 100 w/7828ssc.

Barrel is in "much" better shape than one would expect according to a "local" smith who says he "knows" things about barrels??????
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Old 11-13-2009, 10:56 PM
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Re: Ultra Mag Powders and Barrel Life

Quote:
Originally Posted by MontanaRifleman View Post
I dug up an old (4 yrs) thread on this subject and wondered if anyone might have some experience or anything to add.

Barrel wear with 7mmRUM

In the article, Kirby says he believes the large overbores can get improved barrel life by switching from the stick powders to the newer ball powders which he believes are fairly temp stable and will burn "clean" at higher pressures. These include Ramshot Magnum and AA8700. He says these powders dont burn as "hot" as the stick powders.

Kirby, sorry to take your name in vain, but I find this a fascinating subject, especially scince I have a 300 RUM and am considering a 7.

Anyway, was wondering if anyone else has any experience and insight with this that they could share on the subject. Any one using these powders in their Ultra's?

Mark
Mark
The military did a lot of testing to determine what type of powder was best for long wear
and determined that the ball powder seamed to be less abrasive on the throat of barrels.

They felt that it was the shape instead of burn rate or temperature. The stick powders eroded
faster because of the sharp edges on the cylindrical powders.

They were also looking for a certain port pressure for there gas guns and the ball powder
was easier to predict at barrel lengths to the port.

As to the issue of cooler or less temperature sensitive , There are some ball powders that
are extremely temp sensitive. (One of my favorite powders ,H414 is one of those) but there
are some stick powders that are also heat/temp sensitive.

I feel that poor barrel maintenance has more to do with barrel ware that any other one thing.

Case capacity,velocity,barrel temperature, cleaning,type of powder, amount of fouling all
contribute to barrel ware. That is the reason the military tries to hold velocity to around
3000 ft/sec, use ball powders and know that the rifles cannot be cleaned every time they
are shot. And also temperatures will sometimes be high during a fire fight.

I have barrels that use stick powder that have over 20,000 rounds through them and accuracy
is still sub 1/2 MOA.

On the big Magnums I use a lot of H 50BMG (Stick) and H869 (Ball) depending on what the rifle
likes and don't worry about the barrel getting 20,000 rounds through it because they are
hunting rifles and with proper cleaning they should last a lifetime.

So enjoy the rifles and feed them what they like.

Just my 2 cents

J E CUSTOM
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  #7  
Old 11-13-2009, 11:29 PM
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Re: Ultra Mag Powders and Barrel Life

Don't know where I picked this up but here it is


Might convince a few to use faster powders
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