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4,000+ fps How Long to Burn the Barrel

 
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  #8  
Old 09-30-2011, 10:46 AM
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Re: 4,000+ fps How Long to Burn the Barrel

My 220 swift went from 5/16" groups when new to right over 1" groups at 1600 rounds. Most of these 1600 rounds were shot prairie dog killing (about as abusive as anything). This rifle shot best .010" off the lands and I could no longer reach this point due to throat erosion.
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  #9  
Old 09-30-2011, 12:35 PM
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Re: 4,000+ fps How Long to Burn the Barrel

there is a little more to the equation than just going 4000 fps at the muzzle. Case design and throat design are also major factors to this as well. Longer necks verses shorter necks are well known to promote a longer barrel life. Even certain types of powders will errode a throat quicker than others will. Plus the shoulder angle has a lot to do with throat life. Then there's also the idea that certain powders produce a higher range of heat during their burn than others do (4064 comes to light). Huge cases that are very overbore tend to also blast the barrel like a sand blaster with unburnt powder granules.
gary
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  #10  
Old 09-30-2011, 04:13 PM
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Re: 4,000+ fps How Long to Burn the Barrel

I doubt OP, with ADD, hung around to see any answers...
We're getting more & more trolls on this site..
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  #11  
Old 09-30-2011, 07:40 PM
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Re: 4,000+ fps How Long to Burn the Barrel

Cartridges burning 1 grain of powder for each square millimeter of the bore's cross sectional area produce this many rounds of barrel life before a fall off in accuracy will usually be seen:

1/4 MOA (at worst) at 100 yards to start with, 3000 rounds of barrel life.

1/2 to 3/4 MOA starting out at 100 yards, 6000 rounds of barrel life.

1 to 1.5 MOA, 10,000 rounds. These are the typical numbers for US 30 caliber service rifles, the M1 and M14. I would imagine the 5.56 NATO would be close to the same, but have no experience or other info to go on.

Double the powder charge weight for a given bore and barrel life goes down to 1/4 as many shots.
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  #12  
Old 09-30-2011, 10:32 PM
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Re: 4,000+ fps How Long to Burn the Barrel

Hmmm; useless, fake, foolish, ADD, troll.....
Pretty harsh guys
No wonder novices steer from our passion because of arrogant conciets.

Kudo's to the rest of you !!!!
FYI, I mis-keyed my post and could not edit the senario (administrative only)

I replace my Krieger blanks (6mm BR) after about 300 rounds when the group cloverleafs. Below 3k fps

I will leave it with you and the keyboard critics.

So the rest of you guys can go get FUBAR
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  #13  
Old 09-30-2011, 11:22 PM
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Re: 4,000+ fps How Long to Burn the Barrel

Quote:
Originally Posted by huntingdave View Post
Muliple factors, I know.
Depending on the bore size and powder volume barrels wear out at different rates.

A 4000 ft/sec bullet in a .223 cal will last anywhere from 1500 to 3000 rounds if taken
care of and not allowed to get to hot.

At these velocities the bigger the bullet the shorter the barrel life.

As stated there are other variables like twist rate, barrel size,type of bullets and so on.

If it is a hunting rifle chances are you will not shoot the barrel out soon. if you are hunting
P Dogs it will happen all to soon.

Normally velocities of less than 3000 ft/sec are very easy on barrels 3000 to 3500 are
exceptable in most cases but barrel life will be shorter.

Once you exceed 4000 ft/sec the barrel life realy goes down hill and at 4400 to 4500
you will be looking at 1000 to 1200 rounds before some accuracy loss appears.

This is not scientific, just my experance.

J E CUSTOM
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  #14  
Old 10-01-2011, 01:30 PM
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Re: 4,000+ fps How Long to Burn the Barrel

REM 788 22-250: One summer of good jackrabbit shooting. 1500 rounds.

270 Win Douglas barrel. 130 gr Sierra Boat Tails @ 3200 and 90gr Sierras @ 3400: Shooting chucks, yotes deer and paper. 1967 - 2007. Greater than 3000 rounds.

270 Allen Magnum - 150 NAB @ 3600, 170gr@ 3400, 195gr @ 3100 I'm estimating from bore appearance @ about 900 rounds that she may make, on the outside, 1500 rounds.

Never owned my bench guns long enough to come close to barrel wear affecting accuracy. Some one always talked me out of them.
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