ballistic coefficient questions . 6.5 mm bullets

[Outlaw6.0]

You might wan to run this twist calcultor. the CE 130 is 1.417" long

http://www.bergerbullets.com/litz/TwistRuleAlt.php

I was just playing around with this calculator. I threw in some SWAG numbers for a 140grn CEB @ 1.650, my altitude, twist & expected muzzle velocity between 3200-3300. It looks as though it will stabilize albeit marginally. If I can ever get Cutting Edge to return my request, I will be ordering some (if they're hunting bullets).


t

 

[Edd]

Midway shows to have them in stock.

 

[barnesuser28]

Tag, interesting thread

 

[Outlaw6.0]

Midway shows to have them in stock.

$68.99
Available Cutting Edge Bullets Match Tactical Hunting Bullets 264 Caliber, 6.5mm (264 Diameter) 140 Grain Low Drag Hollow Point Boat Tail Max Box of 50
Product #: 714633



Well here they are...but there is NO data on the bullet! lol Every time I click the link it cannot find the page listing the specifics... Go figure.


t

 

[Outlaw6.0]

Just got off the phone with CEB. Item # MTH-G10 140 grain.

Tech support guys are at SHOT (jerks ). We'll see if I can dig up some more.


t

 

[MontanaRifleman]

I was just playing around with this calculator. I threw in some SWAG numbers for a 140grn CEB @ 1.650, my altitude, twist & expected muzzle velocity between 3200-3300. It looks as though it will stabilize albeit marginally. If I can ever get Cutting Edge to return my request, I will be ordering some (if they're hunting bullets).


t

I think the bullet will be less than 1.6. I'm guessing 1.51 0r 1.52 using that and 3000' elevation for Eastern Montana and 3300 fps, I'm showing a SF of 1.51, good to go if they're hunting bullets.

 

[bigngreen]

I think CTF is fur hunting and not wanting massive hide damage.

I saw that, I'm simply saying that one should try a bullet and see first hand how it functions in their situation. I shoot and trap coyotes all winter for fur if the price is right so I shoot two bullets depending on price, one for fur and one for spectacular smack downs. For fur I load a 140 Berger at 3340 and for blowing a hole in them you can see through I shoot a 110 TTSX at 3600fps. The Berger simply opens slow on that light of an animal and the TTSX opens easy and fast and a coyote just can't hold it which is quite entertaining

 

[Cold Trigger Finger]

Which 140 Berger? Ill be starting a 140 at around 2700 fps . I see they have a heavy jacket target bullet. . Any idea if its slower opening than the hunting VLD in 6.5 ?

 

[Outlaw6.0]

I think the bullet will be less than 1.6. I'm guessing 1.51 0r 1.52 using that and 3000' elevation for Eastern Montana and 3300 fps, I'm showing a SF of 1.51, good to go if they're hunting bullets.

I was rolling with a pure Scientific Wild *** Guess on length.

Here is All the info I have right now:

Technical Information

Caliber: 264 Caliber, 6.5mm
Bullet Diameter: 0.264
Bullet Weight: 140 Grains
Bullet Length: Not Available
Bullet Style: Low Drag Hollow Point Boat-Tail Max
Bullet Coating: Non-Coated
Minimum Barrel Twist: 1:7"

Ballistics Information
Ballistic Coefficient: Coming Soon...
Sectional Density: 0.287


Go figure... all the info we need is.... not there. On the other handlightbulb the Description does say Match/Tactical/Hunting.....


t

 

[MontanaRifleman]

I saw that, I'm simply saying that one should try a bullet and see first hand how it functions in their situation. I shoot and trap coyotes all winter for fur if the price is right so I shoot two bullets depending on price, one for fur and one for spectacular smack downs. For fur I load a 140 Berger at 3340 and for blowing a hole in them you can see through I shoot a 110 TTSX at 3600fps. The Berger simply opens slow on that light of an animal and the TTSX opens easy and fast and a coyote just can't hold it which is quite entertaining

I would have thought the Bergers would leave the big hole and the TTSX's smaller holes. Interesting.

 

[MontanaRifleman]

I was rolling with a pure Scientific Wild *** Guess on length.

Here is All the info I have right now:

Technical Information

Caliber: 264 Caliber, 6.5mm
Bullet Diameter: 0.264
Bullet Weight: 140 Grains
Bullet Length: Not Available
Bullet Style: Low Drag Hollow Point Boat-Tail Max
Bullet Coating: Non-Coated
Minimum Barrel Twist: 1:7"

Ballistics Information
Ballistic Coefficient: Coming Soon...
Sectional Density: 0.287


Go figure... all the info we need is.... not there. On the other handlightbulb the Description does say Match/Tactical/Hunting.....


t

Yeah, I figured they were at the Shot Show.

We could always make up a BC... .75 sound good to me

 

[Edd]

The BC is estimated to be .600.

 

[Outlaw6.0]

The BC is estimated to be .600.

I sure hope it's better than that... with their G1's running above normal in all other calibers, I was hoping for .625-.650


t

 

[MontanaRifleman]

I sure hope it's better than that... with their G1's running above normal in all other calibers, I was hoping for .625-.650


t

With the 130's showing an estimated .56 BC, it's doubtful the 140's will increase to more than .6. In fact, a .04 jump for 10gr increase in mass is probably optimistic.