barrel life with different bullets

A5scott

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I'm not too worried about barrel life, as barrels are a consumable, but that doesn't mean I don't want to get the most life I can... I was curious if for example in 6.5x47 24" bbl, 130 Berger hybrids at 2900 fps will burn the same barrel faster than Berger Hybrid 140's @ 2700 fps?
Anyway, I figured I'd throw that out there to see if anyone has any input.

Scott
 

MtnCreek

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Assuming the same powder and pressure, I’d say the lighter bullet with more powder behind it. How you shoot it will ultimately make a much bigger difference.
 

EOD350

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Just my 2 cents, but after a ton of reading and texting to more knowledgeable folks, heavier bullets wear barrels faster than lighter ones. I asked this same question years ago on a BR site and the overwhelming reply was heavier bullets. The reasoning is it takes more to get the heavier bullet going, which in turn pressure adds up. In example in my 300wm I built it around the 190 MK, I re-barreled at 2200 rounds. On the new barrel I used 215 Berger's. At 1650 I am really chasing the lands now. Again just my experience.
 

Milo 2.5

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This one really has to be conjecture, too many variables and too many sources of info. One thing for certain, the more pressure you build, the worse it has to be. Not too many people have actually worn out the rifling in a barrel, it's throat wear and pressure loss and extreme freebore that result in inaccuracy.
Think of all what would have to go into gathering data to prove this point.
1. Barrel brand-hardness
2. Powders-lot #'s
3. Bullets- design of bullets
4. etc....
Think of the time it would take, then do you or anyone else trust the source? A lot of #fakenews out there.
 

A5scott

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Thanks everyone, yes that's what I was getting at, the point at which the throat erodes and accuracy degrades. And yes, many variables to control in a study, so it's about impossible to get an answer with anecdotal data points.

Scott
 

RampedRaptor

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Wouldn’t barrel wear be more related to bearing surface area than the actual bullet weight? So 2 bullets (same caliber) that weight the same but one has a greater bearing surface should “wear” the barrel out faster. Bearing surface= friction
 
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A5scott

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Wouldn’t barrel wear be more related to bearing surface area than the actual bullet weight? So 2 bullets (same caliber) that weight the same but one has a greater bearing surface should “wear” the barrel out faster. Bearing surface= friction

So bullet geometry, yeah, more surface area, more friction, more heat.

Scott
 

supercorndogs

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Wouldn’t barrel wear be more related to bearing surface area than the actual bullet weight? So 2 bullets (same caliber) that weight the same but one has a greater bearing surface should “wear” the barrel out faster. Bearing surface= friction

But as Milo said, we don't wear out the rifling, we wear out the throats. Heat I.E firing schedule being a big factor on this one.
 

Ledzep

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    Yeah it's exposure to high temp/pressure gasses that eats the steel away in the throat that is the primary cause for accuracy degradation. Pressures are more or less equal between heavy and light bullets. More energy required to move a heavier bullet faster goes primarily to the type/amount of powder used....

    For example,

    If you shoot a heavy and a light bullet with the same powder you either run at the same speed with the heavy bullet generating much more pressure, or a the same pressure (less powder) with the heavy bullet going slower.

    So I don't believe the issue is that heavy bullets cause more pressure. There may be something to bearing length because the rifling has to engrave more bullet, but I don't know how you'd conduct a "fair" test of this subject.

    Changing powders changes burn rate and temp, keeping the same powder you have two different charges (different amount of "fuel") OR you have different pressures keeping the same charge (obviously whatever is safe for the heavier bullet).

    Then potentially bullet geometry plays a part so you'd have to use a bullet with the same jacket but different core size. Interesting subject... My gut says that lighter bullets with more charge of faster burning powder is going to be worse for barrel life, pressures being more or less equal, but it's just a guess.

    Another interesting question is what effect bullet geometry has. If a flat base bullet gets more barrel life than a boat tail or visa versa.
     

    MtnCreek

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    7-08 vs 7rm, both shooting the same 168 gr bullet at the same pressure. Which one gets shot out first? I think it's more to do with powder than bullet, but that's just my thinking.