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Throat erosion and double-based powders.

 
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  #36  
Old 05-20-2012, 10:53 AM
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Re: Throat erosion and double-based powders.

Absolutely infrickininsane!!
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  #37  
Old 05-24-2012, 12:38 AM
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Re: Throat erosion and double-based powders.

I have no idea about all this double base, ball, and other stuff eating barrels. My experience is the worst thing on a barrel is shooting it hot. I have seen guys litterally shoot guns to the point the barrel is smoking the gun oil. I believe not shooting a cool barrel is the worst thing a person can do on a barrels life.

I watched one guy ruin a .5" 308 in 200 rounds. He shot 5 shot groups one after the other continually as fast as he could. I have never seen a rifle barrel that hot ever. He was trying to prove that "modern" guns could be shot hot and it would not hurt them. Rifle would not group under 1" after he was done.

I shoot 120 Ballistic Tips out of my 7STW Sendero at 3600fps using RL22. I don't heat it and never shoot more then five rounds from a cool barrel. I have over 1600 documented rounds through it. Still shoots .5 or less for 5. This is my varmint gun and I use it for coyotes at 0 degrees and ground hogs at 90 degrees. I also do not clean until at least 100 rounds are shot through it. Same POI regardless.

Just a couple of my limited experieces.
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  #38  
Old 05-25-2012, 07:33 AM
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Re: Throat erosion and double-based powders.

I have a 7RUM and RL-25 and 120 Nos B-tips along with some resized cases ready. I could run some velocity test with. It's a factory barrel LSS 700.
It shoots the 162's at 3350 with 93.0 of Retumbo into itty bitty holes at 100. The local gunsmith said he could make me another barrel with his custom min-spec reamer when I burn this one out! This might be my opportunity.

Hammonds' Rifles - The Hammonds' Hunter

His web site needs updated
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  #39  
Old 05-25-2012, 06:53 PM
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Re: Throat erosion and double-based powders.

i have a savage 112fv in 7 rem mag and shot only 71.5 grns of rl19 behind a 120 grn balistic tip and was seeing faster speeds than i imagined around 3680 fps. my barrel lasted about 700 rounds before the accuracy went south. upon bore scoping the bore,i found that not only did the barrel suffer throat erosion,i actually lost three lands at the front of the throat that seemed to have broke off completely and also had a bad case of fire cracking as well. the 7 rem mag is still my favorite caliberbut the next one i build won't be getting any rl19 fed thru it.
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