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Joined: May 2005
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Campfire Tracker
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OP
Campfire Tracker
Joined: May 2005
Posts: 3,428 |
test1328,
I have tested a bunch if different bullets in a pair of .264's, one an original M70 Westerner with a 26" 1-9 twist barrel, and the other a recent Ruger Hawkeye with a 24" 1-8 twist barrel. Had zero problems getting any bullet (including 140 Berger VLD's) to stabilize here in southwestern Montana at around 4000 feet above sea level. Had the same experience with a 1-9 twist 6.5-06 I had for a while around a decade ago, where the 140 VLD was the most accurate bullet.
I doubt you'd have any difficulties in Colorado.
Thanks, MD. That's good to know. I'll have to give some a try. I do my target work at around 5,000 ft elevation, but most of my hunting (deer and elk) is done over 10,000 ft. Not sure how much difference that would make.
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Joined: Jun 2004
Posts: 44,823
Campfire 'Bwana
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Campfire 'Bwana
Joined: Jun 2004
Posts: 44,823 |
However much, the difference would be in your favor.
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Joined: Jul 2001
Posts: 60,089
Campfire Kahuna
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Campfire Kahuna
Joined: Jul 2001
Posts: 60,089 |
And at 10,000 feet considerably in your favor.
There are several on-line computer formulas that calculate bullet stability in various twists at various elevations and temperatures. I use the ones on the Berger and JBM websites.
“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.”
John Steinbeck
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Joined: Sep 2009
Posts: 46,245
Campfire 'Bwana
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Campfire 'Bwana
Joined: Sep 2009
Posts: 46,245 |
Wait till you put one in a bull! 10-4, I have no doubt id be dressing that bull in short order after the shot. 
Trump Won!
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Joined: Mar 2004
Posts: 7,126
Campfire Tracker
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Campfire Tracker
Joined: Mar 2004
Posts: 7,126 |
The 7mm STW's factory ballistics have never been reduced, because they were developed AFTER the change to electronic testting. But you may be remembering when the 7mm was a wildcat, and many people (Including Layne Simpson) were reporting muzzle velocities close to 3700 fps with 140's and 3500 with 160's. But when Remington pressure-tested those loads, they were way over the long-time SAAMI maximum of 65,000 PSI for ANY cartridge. In fact most were 70,000-75,000 PSI. Whether that is a safe pressure level is another question--but SAAMi prefers to stay on the safe side, so the factory-standard velocities were reduced.
Approximately what chamber pressure flattens Federal 215 primers?
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Joined: Jul 2001
Posts: 60,089
Campfire Kahuna
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Campfire Kahuna
Joined: Jul 2001
Posts: 60,089 |
StrayDog,
Read my column on "Primer Flattening," posted in March and "stickied" to the top of this forum.
“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.”
John Steinbeck
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Joined: Mar 2004
Posts: 7,126
Campfire Tracker
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Campfire Tracker
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OK, I read the article and thanks for the direction.
It was too easy to go down the seeming logical but wrong trail of reducing the powder reduces the flattening.
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Joined: Dec 2015
Posts: 8,283
Campfire Outfitter
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Campfire Outfitter
Joined: Dec 2015
Posts: 8,283 |
My favorites, in order;
.264 - Sugar Ray Robinson
.277 - Rocky Marciano
.284 - Sugar Ray Leonard < this dude cheat`d for his last championship fight , Marvelous Marvin Hagler won that fight .
.257 - Roberto Duran
.308 - Joe Lewis
.338 - George Foreman < Foreman was the best heavy weight boxer of all time nobody could stand and fight with him i own all these cartridges but if i fly to hunt i always take the Rem. 7 mag. reason ammo is easier to find if i need more.
Last edited by pete53; 09/14/19.
LIFE NRA , we vote Red up here, Norseman
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Joined: Apr 2008
Posts: 17,111
Campfire Ranger
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Campfire Ranger
Joined: Apr 2008
Posts: 17,111 |
280 —> Chuck Norris 270 —> Tom Cruise 264 —> George Michael  😂 and the .308> John Wayne
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Joined: Dec 2015
Posts: 8,283
Campfire Outfitter
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Campfire Outfitter
Joined: Dec 2015
Posts: 8,283 |
you forgot Tom Sellick ,Tommy Lee Jones,Robert Duvall,Kevin Costner, even Roy Rogers maybe more ?
LIFE NRA , we vote Red up here, Norseman
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Joined: May 2009
Posts: 2,262
Campfire Regular
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Campfire Regular
Joined: May 2009
Posts: 2,262 |
My favorites, in order;
.264 - Sugar Ray Robinson
.277 - Rocky Marciano
.284 - Sugar Ray Leonard < this dude cheat`d for his last championship fight , Marvelous Marvin Hagler won that fight .
.257 - Roberto Duran
.308 - Joe Lewis
.338 - George Foreman < Foreman was the best heavy weight boxer of all time nobody could stand and fight with him i own all these cartridges but if i fly to hunt i always take the Rem. 7 mag. reason ammo is easier to find if i need more. I agree with you that nobody could stand and fight toe-to-toe with Foreman. But the thing keeping him from being the GOAT is that the rules of boxing do not require the participants to do that. Better boxers exploited George’s weaknesses and defeated him. I 100% agree that Hagler won the fight. I’m not sure Leonard cheated, but he did benefit from a lousy decision. Unfortunately, boxing is known for many such decisions, which opened the door for MMA-style fighting.
What could be a sadder way to end a life than to die having never hunted with great dogs, good friends and your family?
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Joined: Mar 2004
Posts: 7,126
Campfire Tracker
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Campfire Tracker
Joined: Mar 2004
Posts: 7,126 |
[quote=Azshooter] I did locate some two diameter bullets in .264 a few years ago sold by Midway and supposedly made by Remington that are Corelokts. I just recently tried them and to say they were inaccurate would be an understatement. 3-5" "groups" at 100 yards was what I achieved. . That is the way I remember the performance of several different .264 mags. back in the early 1960s. I suspect it was widespread trend enough to have contributed to the popularity of the 7 RM when it came out in 1962.
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