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Decrease throat erosion with longer barrels?

 
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  #1  
Old 06-08-2013, 11:55 AM
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Join Date: Aug 2012
Location: Champaign, IL
Posts: 180
Decrease throat erosion with longer barrels?

Recently I ordered a new Savage LRVP in 22-250 from their custom shop. A few weeks after I ordered it, I began to think, I might have preferred to make a change or two.

The first change I wanted, was a change from the LRPV Synthetic stock to the Palma BR Beavertail stock, which I managed to get changed, but was too late for any other change.
The second change I considered was a change in barrel length from 26 inches to 28, 29 or maybe even a 30 barrel. After pondering over this for a while I opted to keep the 26-inch barrel for one reason only. The possibility of barrel whip & loss of accuracy.

Now I wish Id have posted this before I ordered my new rifle. Im not even sure my concern about barrel whip was valid.

I think the biggest reason most people want a longer barrel is to obtain a higher velocity. However, this wasnt my reason. Ive always been very conscious barrel erosion and have always waited several minutes or more between shots while feeling the barrel to guesstimate when to shoot again.

I have spent hours searching for information hoping to discover someone who has considered & tried the following.

My logic suggested to me, I could use a barrel 2-4 inches longer (28-30) and load to the same velocity as a 24-26 inch barrel with a lighter powder charge and possibly reduce barrel erosion. Maybe this concept would also work with an Ackley improved cartridge.
As mentioned before, I do not want to sacrifice accuracy from barrel whip for barrel life.

My rifle will have the LRPV fluted barrel (added cooling & lighter weight) & the Palma BR beavertail stock with vents, which I want for added cooling & the way it sits a bit better on the front rest.

Any input from experienced long-range shooters would be appreciated.
If a new rifle or a new barrel is in the future for me, I want to be sure Ive considered everything possible.

I hope this all makes sense, because it seems a bit disorganized to me.

Spencer
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  #2  
Old 06-08-2013, 12:19 PM
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Join Date: Sep 2005
Location: Central AZ
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Re: Decrease throat erosion with longer barrels?

To my knowledge, barrel length has little or nothing to do with erosion in the throat area. Charge weight (hot loads) and rate of fire seem to be the two variables that impact erosion the most.
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  #3  
Old 06-08-2013, 12:24 PM
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Join Date: May 2013
Location: Elkhorn Idaho
Posts: 297
Re: Decrease throat erosion with longer barrels?

I have always been a advocate of longer barrels to a point. Barrel whip is very much a factor... If a Standard Mag (7mm-300mag) Barrel is around the 28 in range and the SUPER MAGS( ultra, 30-378 etc) mags are around 31 inches in length, One would be able to load up to max loads and pressures and back off 2 grains to their SWEET SPOT. The sweet spot should be above the velocity and power of a standard 22 to 24 in barrel and far superior killing potential and accuracy. I might add that I have done several long barrel mag jobs on Weatherby cartridges with both carbon wrapped technologies out today. Both gave me more barrel whip and lesser accuracy than a fluted standard barrel.
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Old 06-08-2013, 01:12 PM
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Re: Decrease throat erosion with longer barrels?

Quote:
Originally Posted by azsugarbear View Post
To my knowledge, barrel length has little or nothing to do with erosion in the throat area. Charge weight (hot loads) and rate of fire seem to be the two variables that impact erosion the most.
That was my point. I considered you could get the same velocity with a longer barrel using less powder. Hence get less barrel erosion than a shorter barrel with the same velocity.

I haven't read about anyone trying this before.

Spencer
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Old 06-08-2013, 01:46 PM
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Join Date: Aug 2012
Location: Champaign, IL
Posts: 180
Re: Decrease throat erosion with longer barrels?

Quote:
Originally Posted by idaho elk hunter View Post
I have always been a advocate of longer barrels to a point. Barrel whip is very much a factor... If a Standard Mag (7mm-300mag) Barrel is around the 28 in range and the SUPER MAGS( ultra, 30-378 etc) mags are around 31 inches in length, One would be able to load up to max loads and pressures and back off 2 grains to their SWEET SPOT. The sweet spot should be above the velocity and power of a standard 22 to 24 in barrel and far superior killing potential and accuracy. I might add that I have done several long barrel mag jobs on Weatherby cartridges with both carbon wrapped technologies out today. Both gave me more barrel whip and lesser accuracy than a fluted standard barrel.
Since I'm not a hunter other than backyard squirrels or rabbits eating my garden. I'm not too concerned about getting maximum velocity.

However, maybe I can get what's considered maximum velocity from a 26 inch barrel out of a 28-30 inch barrel with a lighter power charge. Less powder, less erosion.

Savage sells at least three of their guns with a 30 inch barrel and one with a 29 inch barrel. These are all Target Series rifles, which I assume all are capable of competition at 1000 yards.

If 3-4 inches of additional barrel length over a 26 inch barrel will give me a signifiant gain in velocity, then I could easily load back to a lower velocity with less powder.

Remember, I'm only looking for less barrel erosion.

I'm just a paper puncher with only a maximum of 500 yards available.

I have also looked for some charts that would give me velocity gains for each inch of barrel length for the same charge weight. So far, no luck.

I'd just like to run across someone who's considered this approach to less barrel erosion.

Apparently I was correct in thinking my original post was a bit confusing. The questions I've been asked so far have helped me to explain things (hopefully) a little better.
I've never read about anyone considering a longer barrel for anything other than a higher velocity.

If this still seems confusing, please tell me. I won't get good answers if I don't ask questions that make sense.

Spencer
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  #6  
Old 06-08-2013, 03:18 PM
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Join Date: Jun 2013
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Re: Decrease throat erosion with longer barrels?

1) use a longer bbl/rate of twist to get more bullet stability

2) reduce throat erosion by keeping your pressures down.........
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  #7  
Old 06-08-2013, 03:32 PM
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Location: Champaign, IL
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Re: Decrease throat erosion with longer barrels?

Quote:
Originally Posted by xjsdvr View Post
1) use a longer bbl/rate of twist to get more bullet stability

2) reduce throat erosion by keeping your pressures down.........
1 in 9" twist is plenty fast enough for the bullets Ill be shooting in 22 caliber.

Less powder is exactly what I was suggesting when going to a longer barrel.

Spence
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