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CEB 140grn G10 MTH & 6.5 WSM-

 
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  #64  
Old 07-16-2013, 12:42 AM
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Re: CEB 140grn G10 MTH & 6.5 WSM-

[quote]
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Originally Posted by bigngreen View Post
I think that maybe putting this bullet into a media that would provide more hydraulic action in the tip may result in something different, pilling this bullet into a board may just turn it into a solid because of tip damage. With the cup and core bullets the bullets can break in half or collapse exposing softer material that will expand but with mono bullets we don't have any back up if that nose does not open which in my mind make the method of how expantion starts much more critical.
I agree with all the above and hopefully i can get some 140's into waterjugs downrange, in the 1800 fps range.

Quote:
The impact velocity was calculated with a .306 G7 BC so it could be lower but not below 1800 fps for sure, many long rang bullets will open at that velocity and that is why I'm interested in the CEB, it has many characteristics of a long range bullet but it must open at that 1800 FPS mark or it is really only suitable for standard hunting ranges.
I wouldn't say say just "for standard hunting ranges" If they open at 1900-2000, that would get me past 1000 yds with good momentum and KE.

Quote:
I think the 6.5 cal can be a hard size to get what you want, you have a narrow frontal area combined with a long straight bullet, even some of the more frangible bullets in other cals seem to hold together better in the 6.5, I would expect a 338 bullet to initiate expantion easier with the addition of a huge frontal are. When testing bullets it a bad assumption that one cal reacting in one way is an indicator that all of them will react the same, sometimes you need to tweak something because the forces on the bullet has change enough to need a design mod.
Yup

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Hopefully no one takes my post as the bullet is scrap, it just needs to be modified or the test needs modified or maybe we just flat went beyond this particular bullets capability but shooting and reporting then hashing it out is the only means we make gains in knowledge.
Could be that you went beyond the bullet's range for that velocity, altitude, etc., but as you already mentioned, let's see what it does in a hydraulic medium.
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  #65  
Old 07-16-2013, 03:47 PM
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Re: CEB 140grn G10 MTH & 6.5 WSM-

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Originally Posted by MontanaRifleman View Post
Thanks, the video is great.
Tumbling and forming the banana shape we saw, happens quite often with the rigid models of military fmj. It can be a good means of decreasing sd to maximise energy output inside the target medium without having the bullet disintegrate (libtard interpretations of the hague convention &c). Problem is though, that you have very long narrow channels in most cases. The wound caverty occurs not until half or nearly all of the target is penetrated, especially with small framed game in the 100# area.

It would be nice to see some tests of the 140gr CEB in a more realistic test medium like ballistic gelatine or soaked newspaper. Maybe then we will see some expansion.
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  #66  
Old 12-29-2013, 08:27 PM
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Re: CEB 140grn G10 MTH & 6.5 WSM-

Well, I finally got out and shot some 143 MTAC's out of the 8" twist 6.5 WSM. Didn't quite stabilize as you can see in the pic. 2 out of 5 did stabilize, but the ain't good enough

Rhian, I've got 45 left over if you want them, otherwise I'll ship them back to Cutting Edge. They are exactley the same dimensions as the 140 MTH's, just no HP drilled into them. They would probably make a good coyote or wolf bullet for good pelts. A wuff or two might run off a ways and not get found... oh well

This was pressure testing load development. Velocities were pretty good with RL33. Elevation was 4000', baro 5 miles away at Three Forks was 30.12 and temp was 23.
Attached Thumbnails - Click to View Larger
CEB 140grn G10 MTH & 6.5 WSM--ncm_0003.jpg  
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  #67  
Old 12-29-2013, 11:31 PM
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Re: CEB 140grn G10 MTH & 6.5 WSM-

Huh, that sucks they did not stabilize! I let my bro in law shoot up the last 140's I had loaded in the 6.5 SS today and they shot amazing, after this hunting season all I need is a range with them cause I know the bullet is landing where I'm dialed I'm very confident with this bullet as far as accuracy, terminal performance is what you'd expect from a copper bullet which I'm going to have to decide before next season if that is something I can live with!

Thanks for the bullet offer but I honestly would not have a need for them in there pointy form.

What stability factor were you at?
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  #68  
Old 12-30-2013, 12:13 AM
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Re: CEB 140grn G10 MTH & 6.5 WSM-

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Originally Posted by bigngreen View Post

What stability factor were you at?
Using the Berger calc, it shows anywhere from 1.42 to 1.46, depending on velocity. It seems obvious that calc is not accurate for copper monometals. I'm guessing you are on the ragged edge of stability, being a little higher in elevation.

2 of mine stabilized and 3 didn't.
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