264 Win Mag LR bullets

Wolf01

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It's my understanding that with a 1:7 twist, when bullets start getting pushed to around 3200 fps & above, chances of the jacket getting slung off significantly increases. But that also has alot to do with a couple of other things. The bullet itself. A thin jacketed bullet would be more susceptible than a thicker jacketed bullet, or bonded bullets. The other thing that would make a difference is the rifling configuration. A 5R or 6 groove that's free from bore finish flaws & severe wear in a 1:7 twist would decrease the chances of slinging the jacket off of a thin jacketed bullet when pushed beyond 3200 fps.
I shoot copper. However, I've had 264 cal PSP hold up to 3400.
 

Wolf01

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Here’s some real world experience. In my 9 twist 6.5x55 shooting at sea level I was never able to get good accuracy out of any bullet over about 1.35” long. Some of the shorther 140s worked like the Hornady 140 hpbt. The absolute best accuracy I saw was out of the 135 Berger Classic Hunter (1.325”) at 2870. In my conditions that bullet has an sg of 1.4. In my opinion it has the highest BC (.303 g7) you can shoot in a 9 twist. The 130 VLDs are the same length but 5 grains lighter and therefore have a lower sg but still shot well, just not as well. The 129 ABLR is 1.37 long (even lower sg) and my accuracy was all over the place at 2+” in that gun. The next best option is the 130 AR Hybrid (.287 G7 1.29” long), and with the slightly heavier jacket may be a better option at .264 WM speeds. 3200-3300 should be possible in a 26” barrel and that load would be no slouch.
I believe that wt is correct for 264 in 1 and 9 twist. Factory twist. If they'd just played a bit more the 264 would have( good Lord here it comes) been a real threat to the 7 mag. Mashburn was no fool for sure.
 

Wolf01

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Silver springs , Nv.
So. Y’all think the Berger Ballistics calcs are better / more accurate than the JBM Ballistics?

There are substantial differences in the data points used, Berger vs JBM. E.g. JBM wants length of plastic tip. Berger doesn’t. Of course Berg bullets don’t have a plastic tip. The plastic tip length is greater than the overall length delta between roughly equivalent Berg & ABLR bullets.

What makes Berger’s calcs mo-betta???
Valid point
 

Wolf01

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Silver springs , Nv.
Not much that hasn’t been done. High BC bullets are typically longer, and twist rates faster. The 6.5’s caught a break using modern bullets as 1-8” twist are usual, so room for longer bullets was already done. Berger recommends a 1-8” twist for the 156 EOL. Which is as high a BC in common use.

I have a 1-6” twist 6.5, I wouldn’t do less than 1-7”, and probably a 1-6.5” to stabilize all bullets out there.
Heavy ones for sure.
 

Wolf01

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Silver springs , Nv.
I've never tried any 6.5 with slower twist than
1:8, which seems to handle 130 to 156 gr bullets @1500' asl.

I'm building a new 264 wm set-up for the 156 EOL and 150 Sierra's, so I went with 1:7.5 twist.

You might get by, but that's taking a chance.
I think it will work well. 1 in 7.5 is really good. While not ideal, I've got 160's to work at 1 in 9 with a slightly reduced charge.
 

Trnelson

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Feb 15, 2012
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Nebraska
If one had a 1:7 twist with the muzzle velocities of a 264 W Mag wouldn't you spin the jackets off the bullets because of the excessive rotation speed?
In my experience, No. I’ve shot ~500 of the 160g Matrix VLD’s from my 8-7 gain twist 264WM out to 1,400y. In a previous 7 twist barrel i shot 140g Berger’s, 143ELDX and 130g Berger AR Hybrids with the 140’s clocking 3,200-3,250 and the 130g at just over 3,300. The throat condition of your rifle has quite a bit to do with jacket skeiving and bullet failure
 

West Calamus

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texas
In my experience, No. I’ve shot ~500 of the 160g Matrix VLD’s from my 8-7 gain twist 264WM out to 1,400y. In a previous 7 twist barrel i shot 140g Berger’s, 143ELDX and 130g Berger AR Hybrids with the 140’s clocking 3,200-3,250 and the 130g at just over 3,300. The throat condition of your rifle has quite a bit to do with jacket skeiving and bullet failure
Thx for sharing your real world experience. appreciate it . You had the 140's smoking.
 

Hespco

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Mar 6, 2019
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W. Montana
Out of my Win 70 EW 26" , 1/9 twist Bbl. Using VV24N41, Nosler 140gr AB ( BC 509 ) , vel 3229fps. Sub 1/2" at 100. Longest shot I've practiced at, 522yds. They were spot on at that range. Sorry , no paper target, just steel plate. Beyond this range I can't comment.
 

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