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ballistic coefficient questions . 6.5 mm bullets

 
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  #71  
Old 01-17-2013, 06:59 PM
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Re: ballistic coefficient questions . 6.5 mm bullets

I think it would be a great tryout for the bullet. Specially on a Big hog. . If you got double shoulder penetration on a 500 lb hog then I would bet it would do the same on a moose. And the same on a same size black bear.
It would be quite the all around bullet.
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  #72  
Old 01-17-2013, 07:22 PM
Edd Edd is offline
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Re: ballistic coefficient questions . 6.5 mm bullets

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Originally Posted by Cold Trigger Finger View Post
I think it would be a great tryout for the bullet. Specially on a Big hog. . If you got double shoulder penetration on a 500 lb hog then I would bet it would do the same on a moose. And the same on a same size black bear.
It would be quite the all around bullet.
They have a 100 gr brass bullet for close range.
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  #73  
Old 01-17-2013, 07:46 PM
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Re: ballistic coefficient questions . 6.5 mm bullets

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Originally Posted by Beng View Post
The point where it gets a bit darker in color then, about a third of a caliber above my db mark.
Well, I underestimated the ogive's length quite a bit, I've always had problems with finding the point of transition with tangent ogives.
I can't make a comment on driving band, seal tite band &c, I just don't know how to figure those in.
Yes, the 130gr CEB is onehell of a sleek looking bullet, I still don't think it's in the Berger's league, but I'd have to guess blindly on the real form factor and even at .5 it would be a superbly low drag hunting bullet.
I'd love to see more of the CEBs being measured by Bryan Lith, those three that have been measured didn't do that good. Especially the .338 and .264 bullets look much better than the measured ones though.

I'll order some and try them in a 6.5x55 project I'm working on, the hog's won't like them I think
A waste though to use them at short range.
I put a lot of stock in Bryan's research. That said, I only have his first book which doesn't include the .264 CE's. It does mention the 308 180 STD which he finds to be a significantly lower BC then advertised, but his MV is also slower than the CE MV used which will affect G1 BC's. The advertised difference between the STD, MAX and MAX AGG is very small and looking at all 3 with my eyes, there is a fairly significant difference in form.

I think the CE design is ingenious and well thought out. Minimal bearing surface and a front end bore rider which aligns the bullet to the bore. I've only shot the STD 180 .308 cal so far, but they have been very accurate.

You might check the twist requirements of the 130's in your 6.5x55 based on velocity and elevation. Probably a 8 if not tighter.

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  #74  
Old 01-17-2013, 09:29 PM
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Re: ballistic coefficient questions . 6.5 mm bullets

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Originally Posted by Edd View Post
They have a 100 gr brass bullet for close range.
I'm different than most everyone else. IDEALLY I could have 1 load that would work perfectly from 20 yards - 1000 yards .1 bullet 1 powder charge ect.

I wonder how a drop of super glue would work in the hollow pointof a match bullet to keep it from expanding on light animals. ?

The 100 gr brass bullets are the wrong way to go for my purposes ..
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  #75  
Old 01-17-2013, 09:35 PM
Edd Edd is offline
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Re: ballistic coefficient questions . 6.5 mm bullets

Quote:
Originally Posted by Cold Trigger Finger View Post
I'm different than most everyone else. IDEALLY I could have 1 load that would work perfectly from 20 yards - 1000 yards .1 bullet 1 powder charge ect.

I wonder how a drop of super glue would work in the hollow pointof a match bullet to keep it from expanding on light animals. ?

The 100 gr brass bullets are the wrong way to go for my purposes ..
I agree, I only use one load per cartridge. I sometimes switch bullets but I get rid of the old ones when I do.

You do know Cutting Edge makes them without the hole drilled in the nose?
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  #76  
Old 01-18-2013, 01:14 AM
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Re: ballistic coefficient questions . 6.5 mm bullets

This is a fascinating conversation!

I was thinking something similar to what Cold Trigger Finger stated regarding the super glue. I was thinking of wax, but super glue would work better. Edd, I don't think the point of the exercise is to eliminate expansion, just delay it. Hence, the hp design is still preferred.

Having said all that, unless the bc numbers stated by CE are accurate and do not fall off rapidly as the velocity drops, I am not sure this bullet would be useful in any but the very largest cased 6.5's (6.5STW and up) at long range.

The only 6.5 that I own with a fast enough twist to stabilize this bullet is a 6.5-284 and I don't think it will generate enough velocity to justify the cost and performance penalty of this design.

If I can get good accuracy and 3150 or so out of my 9 twist .264WM (which remains to be seen) shooting 140 Bergers or AMAX's, I don't really see the point in shooting this bullet. Even at 200fps faster or so, unless the bc's really are as high as stated and do not degrade significantly as velocity falls off, most of the performance gain is going to be at shorter ranges. To get even that performance gain, I would have to build my rifle around this bullet.

In my rifles, it looks to me like I can obtain the same or better results with less expensive bullets.

So far, the smaller caliber CE bullets kind of leave me cold. The .338 and larger bullets look to me to be worth exploring, though. Still, data derived from actual shooting could well change my mind on this.
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  #77  
Old 01-18-2013, 04:44 AM
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Re: ballistic coefficient questions . 6.5 mm bullets

I will use an 8" twist and I hope to get them to about 2850 fps.
The rifle is being build on a tikka t3 .30-06 stainless, with a bit of work on the bolt stop and mags I should be able to get a coal of 3.3".
Plenty even for the CEBs.

And concerning the cost per bullet, a 100lbs boar costs about as much as 200 CE bullets and those will suffice for 5 years or more including load development and rezeroing.
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