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7.62x51 mm NATO and 308 Winchester cartridges & chambers
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Recently I was informed that while 7.62x51 mm NATO and 308 Winchester cartridges look, to the eye, to be the same, they are not. Also, their chamber specifications I was informed are different. Are these statements accurate?

If they are accurate, does one of the two cartridges become marginally safe when fired in the other's chamber? If this is true, which is which? Were I barrelling a rifle and wanted to assure that whichever cartridge was fired in the rifle was absolutely safe, which [cartridge] chamber would I choose?


It's so simple to be wise. Just think of something stupid to say and then don't say it. Sam Levinson
 
Posts: 1513 | Location: Seeley Lake | Registered: 21 November 2007Reply With Quote
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They are actually different. Incredibly close but different.

http://www.thegunzone.com/30cal.html


Mike

Never under estimate the internet community's ability to reply to your post with their personal rant about their tangentially related, single occurrence issue.



What I have learned on AR, since 2001:
1. The proper answer to: Where is the best place in town to get a steak dinner? is…You should go to Mel's Diner and get the fried chicken.
2. Big game animals can tell the difference between .015 of an inch in diameter, 15 grains of bullet weight, and 150 fps.
3. There is a difference in the performance of two identical projectiles launched at the same velocity if they came from different cartridges.
4. While a double rifle is the perfect DGR, every 375HH bolt gun needs to be modified to carry at least 5 down.
5. While a floor plate and detachable box magazine both use a mechanical latch, only the floor plate latch is reliable. Disregard the fact that every modern military rifle uses a detachable box magazine.
6. The Remington 700 is unreliable regardless of the fact it is the basis of the USMC M40 sniper rifle for 40+ years with no changes to the receiver or extractor and is the choice of more military and law enforcement sniper units than any other rifle.
7. PF actions are not suitable for a DGR and it is irrelevant that the M1, M14, M16, & AK47 which were designed for hunting men that can shoot back are all PF actions.
8. 95 deg F in Africa is different than 95 deg F in TX or CA and that is why you must worry about ammunition temperature in Africa (even though most safaris take place in winter) but not in TX or in CA.
9. The size of a ding in a gun's finish doesn't matter, what matters is whether it’s a safe ding or not.
10. 1 in a row is a trend, 2 in a row is statistically significant, and 3 in a row is an irrefutable fact.
11. Never buy a WSM or RCM cartridge for a safari rifle or your go to rifle in the USA because if they lose your ammo you can't find replacement ammo but don't worry 280 Rem, 338-06, 35 Whelen, and all Weatherby cartridges abound in Africa and back country stores.
12. A well hit animal can run 75 yds. in the open and suddenly drop with no initial blood trail, but the one I shot from 200 yds. away that ran 10 yds. and disappeared into a thicket and was not found was lost because the bullet penciled thru. I am 100% certain of this even though I have no physical evidence.
13. A 300 Win Mag is a 500 yard elk cartridge but a 308 Win is not a 300 yard elk cartridge even though the same bullet is travelling at the same velocity at those respective distances.
 
Posts: 10136 | Location: Loving retirement in Boise, ID | Registered: 16 December 2003Reply With Quote
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Mike:

Since you are a sump pump of AR knowledge, here is, perhaps, the most important thing to learn: An avian in the center of manual dexterity is equivalent to double that amount in a dense arboreal mass. I was fortunate to learn this in sixth grade during a "seventh period" learning experience when I wrote this truth 600 times at the request of Don Moyle, the teacher staying after school with me and several associates.
***
Your link was cogent. The obvious conclusion is to chamber for the commercial cartridge, recognizing that some 7.62 cartridges may not chamber.

Many thanks.


It's so simple to be wise. Just think of something stupid to say and then don't say it. Sam Levinson
 
Posts: 1513 | Location: Seeley Lake | Registered: 21 November 2007Reply With Quote
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well -- i am unsure about all that handy stuff ..

the PRESSURE is the big difference .. firing 308 in a cetme or a spanish bolt gun MIGHT result is setback or broken parts .. the cetme has a reputation for breaking under commerical ammo

The difference in SIZE of the chamber is lost in the +.003 that will get added to the diameters of the reamers

you would ask for a 308 chamber


opinions vary band of bubbas and STC hunting Club

Information on Ammoguide about
the416AR, 458AR, 470AR, 500AR
What is an AR round? Case Drawings 416-458-470AR and 500AR.
476AR,
http://www.weaponsmith.com
 
Posts: 39708 | Location: Conroe, TX | Registered: 01 June 2002Reply With Quote
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Picture of Mike_Dettorre
posted Hide Post
dense percipitation is perceived by the thalmus as a bovine urinating on a planar segment of aggregated and solidifed minerals


Mike

Never under estimate the internet community's ability to reply to your post with their personal rant about their tangentially related, single occurrence issue.



What I have learned on AR, since 2001:
1. The proper answer to: Where is the best place in town to get a steak dinner? is…You should go to Mel's Diner and get the fried chicken.
2. Big game animals can tell the difference between .015 of an inch in diameter, 15 grains of bullet weight, and 150 fps.
3. There is a difference in the performance of two identical projectiles launched at the same velocity if they came from different cartridges.
4. While a double rifle is the perfect DGR, every 375HH bolt gun needs to be modified to carry at least 5 down.
5. While a floor plate and detachable box magazine both use a mechanical latch, only the floor plate latch is reliable. Disregard the fact that every modern military rifle uses a detachable box magazine.
6. The Remington 700 is unreliable regardless of the fact it is the basis of the USMC M40 sniper rifle for 40+ years with no changes to the receiver or extractor and is the choice of more military and law enforcement sniper units than any other rifle.
7. PF actions are not suitable for a DGR and it is irrelevant that the M1, M14, M16, & AK47 which were designed for hunting men that can shoot back are all PF actions.
8. 95 deg F in Africa is different than 95 deg F in TX or CA and that is why you must worry about ammunition temperature in Africa (even though most safaris take place in winter) but not in TX or in CA.
9. The size of a ding in a gun's finish doesn't matter, what matters is whether it’s a safe ding or not.
10. 1 in a row is a trend, 2 in a row is statistically significant, and 3 in a row is an irrefutable fact.
11. Never buy a WSM or RCM cartridge for a safari rifle or your go to rifle in the USA because if they lose your ammo you can't find replacement ammo but don't worry 280 Rem, 338-06, 35 Whelen, and all Weatherby cartridges abound in Africa and back country stores.
12. A well hit animal can run 75 yds. in the open and suddenly drop with no initial blood trail, but the one I shot from 200 yds. away that ran 10 yds. and disappeared into a thicket and was not found was lost because the bullet penciled thru. I am 100% certain of this even though I have no physical evidence.
13. A 300 Win Mag is a 500 yard elk cartridge but a 308 Win is not a 300 yard elk cartridge even though the same bullet is travelling at the same velocity at those respective distances.
 
Posts: 10136 | Location: Loving retirement in Boise, ID | Registered: 16 December 2003Reply With Quote
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