Barrel Life

[trader388]

what kind of barrel life can a guy expect to get out of the following before you start to really lose accuracy?

7mm rem mag:
7mm WSM
30-06:
300 win mag:
300 WSM:
300 ultra mag:
338 ultra mag:

[ 02-23-2004: Message edited by: trader388 ]

[ 02-24-2004: Message edited by: trader388 ]

 

[trader388]

anyone out there have any ideas on this? Using say...shilen match grade barrels.

[ 02-24-2004: Message edited by: trader388 ]

 

[baldeagle713]

I've got a 270 WSM with 850+ rounds threw it.
and it's still shootin!!

 

[Mikecr]

Ok I'll take a shot at it.
300UM -850
7RM -1070
300WM -1200
338UM -1290
300WSM-1750
30-06 -2340
Roughly

 

[BountyHunter]

MikeCRs post is probably close and at least proportionally accurate.

However, other factors will play and be more determinate as to actual life.

such as

3 wide groove vs 4-6 standard groove?

do you shoot it fast and get the barrel hot and keep shooting?

how do you clean, how often etc?

hand lapped match versus factory barrel?

How hot are you pushing them?

Bottom line, push them fast, shoot fast with hot barrels, overbore cartidges and barrel life is like the gas guage on a big engine car. You can watch the guage go down and you had better be ordering another barrel by the time you put this one on.

BH

[ 02-25-2004: Message edited by: BountyHunter ]

 

[Darryl Cassel]

FYI

John Voenida had 1700 rounds on his 30 Cal Magnum rifle when he set the 1000 yard 3.151" ten shot record at Williamsport several years ago.
It was a Clyde Hart barrel.
The write up was in one of the older Sierra Manuals.

Later
DC

 

[demarpaint]

Interesting post:

Lets take a .300 RUM which seems to be growing in popularity rapidly.

What would be the expected barrel life with a match grade 3 groove vs. 6 groove barrel allowing proper cooling, and cleaning?

Frank D

 

[Mikecr]

My numbers were based on a very basic, rule of thumb type formula. Kindof a greenhill gas gauge.
No match for technology or experience.

Play with it: http://www.angelfire.com/id/psycho/images/Barrelife.xls

 

[trader388]

what does bore capacity gr mean?

 

[trader388]

would coated bullets help barrel life in any way? Namely the Barnes XLCs

 

[Mikecr]

Bore capacity in grains is a observed 'grains loaded' capacity where you would get excellent barrel life for a given caliber. For instance, 47.4gr loaded and burned in a .308 bore should offer a potential of ~3500 max accurate life. The standard for this is the 6PPC. It is a preset value, and does not go into firing rate, use of moly, chrome linnings, pressure, powder type, amount pushed down the barrel-vs-burnt in the case, neck length/shoulder angle/flame point, etc. Things that are less than tangeble. That would be a helluva program!
Also, don't confuse this with "bore-overbore", or in expansion factor calcs. Thats completely different.

I doubt that the Barnes coating amounts to anything other than friction/fouling reduction. Needed due to being a solid. Moly on the otherhand, actually flashes, drawing heat from the process, and potentially improving barrel life. This will probably be introduced in upcoming reloading powders. But I won't use it unless they can keep it from coating to my bore.

[ 02-26-2004: Message edited by: Mikecr ]

 

[trader388]

according to barnes little bar charts xlc's reduce pressure much more than moly. Pressure creates heat so in theory xlc would have the edge over moly in this category?

(bar charts are in XLC section of 04 catalog)