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Old December 30, 2020, 09:15 PM   #1
Aqualife
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Explain difference in barrel heat....

30 years ago or so I bought a Winchester 70 264 Win mag with dreams of hunting out west. I’d take it to the range with a box of 140 Remington core-lokt. The barrel would be extremely hot after firing 2 rounds, could never trust the 3rd shot. After waiting between shots I got it zeroed at 200 yds with in a 3” group.

This last year I finally got to take my trip out west for Antelope. I decided to shoot Nosler 100’s. The barrel doesn’t get nearly as hot. I can shoot 5 shot groups with out any issues.

Anyone have any idea why this is the case? More Pressure with the 140?
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Old December 31, 2020, 06:47 PM   #2
Shadow9mm
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If I had to guess, probably the powder used. Some can be "hotter" than others

It could also be the outside temp. Colder temps mean the barrel cools faster.

.264 Mag has a MAX psi of 64,000 psi, so regardless of powder it should not have been over that, although it could have been less.
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Old January 2, 2021, 04:26 PM   #3
RC20
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Bullet length.
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Old January 2, 2021, 07:26 PM   #4
Shadow9mm
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Quote:
Originally Posted by RC20 View Post
Bullet length.
true, a longer bearing surface would create more friction/heat
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Old January 4, 2021, 10:54 AM   #5
jrothWA
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A lots of powder burning and small volume of barrel steel..

Have a M70 First Series post-64, in 7mmMag.
Throat is burned out, long seating the 160 gr bullet out by 0.125" just to hold a paper plate @ 100yds. Presently using 4064 powder to reload as a "7x57" Mauser round. MI whitetails don't seem slighted when shot.

Just eh magnum loads after five shoot the group when outside the black of a 50 yard pistol target, let the rifle sit with muzzle up and bolt open to get a "chimney effect" to cool down,

Bought replacement barrel that seems to have a better throat, will know shortly.
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Old January 4, 2021, 09:05 PM   #6
Aqualife
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So bullet length sounds like as good of a reason as any. In addition the 100’s are moving faster so less time in the barrel, less transfer of heat.

Guess it all adds up.

Thanks everyone.
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Old January 11, 2021, 11:00 AM   #7
jrothWA
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Lighter bullet is higher velocity and more FRICTION.

Slower heavy bullets means more heat rise pushing the heavy bullet.
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Old January 11, 2021, 02:39 PM   #8
jmr40
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Quote:
Bullet length.
Quote:
Slower heavy bullets means more heat rise pushing the heavy bullet.
This certainly seems logical, and I'm not disagreeing. I'm just asking, is this just a guess based on logic, or has anyone seen any documentation to back this up.
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