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Throat erosion and double-based powders.

 
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  #1  
Old 03-24-2012, 10:57 AM
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Throat erosion and double-based powders.

I'm upgrading my Savage 110 7mm rem mag to a heavy stainless 7RUM barrel, and I shoot mostly light bullets (120gr Nosler BT's) that I figure will be sent out at well over 4K, using the maximum powder charge for the RUM. I'm prepared to accept a relatively short barrel life, but I have heard some say that double based powders such as Alliant (I've been using RL-19 in the mag) burn hotter, and therefore will erode the barrel faster.

Is there any truth to this?
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Old 03-25-2012, 09:25 PM
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Re: Throat erosion and double-based powders.

Quote:
Originally Posted by Max Heat View Post
I'm upgrading my Savage 110 7mm rem mag to a heavy stainless 7RUM barrel, and I shoot mostly light bullets (120gr Nosler BT's) that I figure will be sent out at well over 4K, using the maximum powder charge for the RUM. I'm prepared to accept a relatively short barrel life, but I have heard some say that double based powders such as Alliant (I've been using RL-19 in the mag) burn hotter, and therefore will erode the barrel faster.

Is there any truth to this?

Not sure if there is any truth to it. However, I have heard that double based powders have more lubricating properties due to the added Nitro glycerin, which purports to cause less fouling.

There are a lot of variables in throat erosion. I think you'd have a hard time isolating the problem to only the use of double based powders.
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Old 03-26-2012, 12:53 AM
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Re: Throat erosion and double-based powders.

There is a write up somewhere on here on how ball powders won't erode your throat as fast as stick powders because they are less abrasive. Fiftydriver wrote about it I think. Maybe someone will chime in that knows which thread I'm talking about.
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Old 03-26-2012, 08:24 AM
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Re: Throat erosion and double-based powders.

Quote:
Originally Posted by Max Heat View Post
I'm upgrading my Savage 110 7mm rem mag to a heavy stainless 7RUM barrel, and I shoot mostly light bullets (120gr Nosler BT's) that I figure will be sent out at well over 4K, using the maximum powder charge for the RUM.
120's from a 7mm Rem Mag leaving at 4000 fps?

Max loads for 120's from that case leave at about 3300 fps at max safe SAAMI spec pressures. Not only will you get a very short barrel life, you may well shorten your own. Your case life will also be shortened to perhaps 2 loads per case.
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Old 03-26-2012, 10:51 AM
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Re: Throat erosion and double-based powders.

Bart, the OP is re-barreling to 7mm RUM, which should help

OP, I too have just started playing with Double based powder (RL-17). They sure do create more velocity.... anywho VV N-570 is next on my list in a 6.5WSM. I've been using ball powder (RamShot) in several cartridged for years, i'm actually really surprised how well it's treated my 6-284 (RamShot Magnum)... I'm not chasing the lands yet

I wish I could help more, but that is the extent of my limited knowledge.

Out of curiousity, why 120's??? TOF will be impressive but wind deflection should be terrible...
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Old 03-26-2012, 11:33 AM
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Re: Throat erosion and double-based powders.

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Originally Posted by Outlaw6.0 View Post
Bart, the OP is re-barreling to 7mm RUM, which should help
I saw that later, but thanks anyway for the notice.

Both the Rem Mag and Rem Ultra Mag use virtually the same amount of powder for each bullet weight. So the difference is insignificant.
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Old 03-26-2012, 11:36 AM
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Re: Throat erosion and double-based powders.

Quote:
Originally Posted by Outlaw6.0 View Post
OP, I too have just started playing with Double based powder (RL-17). They sure do create more velocity.... anywho VV N-570 is next on my list in a 6.5WSM.

Out of curiousity, why 120's??? TOF will be impressive but wind deflection should be terrible...
The VV N500 series powders are alot like RL-17. Lots of velocity potential. I used to run N-540 in my 308 for 168-190 grain bullets and N-550 for the 208 AMAX. I used RL-17 a bit but to get top velocities with it the seating depth of the bullets was out of where I like to be. N-540 and N-550 allowed for less powder at similar velocities and the powder was a bit finer which let it settle better. 46.0 under the 208 AMAX allowed for 2615 FPS and could seat them deep enough to fit my 700SA with an extended magainze.

I agree on the TOF and subsequent laser flat trajectory but you are right also about the windage sucking.

Max, I realize you are prepared for 'relatively' short barrel life but do you know how short? I would be suprised if it went 100 rounds running 120's at 4000 FPS. Even if you had a 28" barrel. Her life will be not relatively short it will be downright non-existent. RUM case rifles (7mm-300) can last a good bit IF you don't hot rod them. You hot rod it, you pay the price.
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Quote:
Originally Posted by Broz View Post
Please just answer one very simple question. Why would anyone shooting long range load a low BC , low SD 168 gr offering in a 300 win???????

My answer to this is. The only reason is to make the 7 RM look good. There is no other reason.

Jeff.
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