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Joined: Feb 2002
Posts: 13,659
Campfire Outfitter
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OP
Campfire Outfitter
Joined: Feb 2002
Posts: 13,659 |
Dr. Howell-
In regards to the statement that lower peak pressures (thus lower temperature) equates to longer barrel throat life, how much of a difference is enough? Or more appropriately, how much difference would you guess is needed to see a marked difference in throat life? My reason for asking is that I'm putting together a .264 Win, but the barrel (6.5-06 now) is used. I'm thinking that if I load the Win to the performance of the -06 version I should get more barrel life that way. Thanks in advance for any and all advice.
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Joined: Dec 2000
Posts: 29,348
Campfire Ranger
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Campfire Ranger
Joined: Dec 2000
Posts: 29,348 |
This is an educated guess* but should be close enough to be a good general prediction:
With the 140-grain Hornady A-Max seated deep enough to make the over-all cartridge length 3.340 inches (SAAMI maximum), 66.2 grains of Ramshot Magnum (case about 94% full) should give you about 3,100 ft/sec from a 26-inch barrel, at a peak pressure about 50,000 lb/sq in. (maximum for long barrel life).
*by computer simulation
"Good enough" isn't.
Always take your responsibilities seriously but never yourself.
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Joined: Feb 2002
Posts: 13,659
Campfire Outfitter
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OP
Campfire Outfitter
Joined: Feb 2002
Posts: 13,659 |
Thanks for the info. I'll give it a whirl when I get the rifle up and running.
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Joined: Feb 2003
Posts: 647
Campfire Regular
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Campfire Regular
Joined: Feb 2003
Posts: 647 |
Pointer-Campfire Guide is correct about 50,000 psi loads cutting temperatures back to help barrel life.If you could stand to go back to 40-45000 psi loads you could eliminate erosion altogether.Ed.
Ed Hubel
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Joined: Feb 2003
Posts: 647
Campfire Regular
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Campfire Regular
Joined: Feb 2003
Posts: 647 |
Ken--Isn't the reason the 264 fell out of favor because it wore out barrels to fast, was the overbore characteristics of the cartridge for the powders of the day, while running to high of pressures?I even see it today with local pyros buying 30-378, and reloading, but they won't buy the slower powders.They want to do it all with IMR3031 and IMR4350. They scare me.Ed.
Ed Hubel
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