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6.5 ackley Wildcat

 
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  #50  
Old 09-16-2013, 11:51 PM
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Re: 6.5 ackley Wildcat

If I plan on handloading heavier 142gr bullets will the 7" trust still over stabilize?

~WS
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  #51  
Old 09-17-2013, 12:26 AM
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Re: 6.5 ackley Wildcat

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Originally Posted by MontanaRifleman View Post
The 260 Rem (or the 6.5x47) would be good choices for high volume shooting. The bullets you shoot through them are typically stabilized in an 8 twist. You will loose a little performance from them. How much is hard to say. I would consider selling the 7 twist and getting an 8 twist.
How would you lose performance particularly if shooting 140gr VLD's?

The general rule I've always been taught is that you can spin them to slow but you can't spin them to fast to stabilize.
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  #52  
Old 09-17-2013, 12:29 AM
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Re: 6.5 ackley Wildcat

Quote:
Originally Posted by WisconSniper View Post
If I plan on handloading heavier 142gr bullets will the 7" trust still over stabilize?

~WS
I don't believe there's such a thing as an "over stabilized bullet".

The 7 twist is more than you need, but I don't understand how it can be a detriment other than possibly increased spin drift at long range.

There might be an increase in the pressure gradient due to the increased resistance but that is easily solvable when you work up your loads.
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  #53  
Old 09-17-2013, 12:41 AM
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Re: 6.5 ackley Wildcat

The 2 biggest factors in bullet stabilization is the bullet's length and weight. The Bergers in weights of 130-140 require an 8 twist. Matrix makes a 160 that stabilizes in an 8 twist. Cutting Edge makes a 140 that requires a 7 at lower elevations but will stabilize in an 8 at higher elevations. The CE bullet is a good candidate for your barrel but not one I would pick for prairie dog shooting at over a buck per pop.

You would have to get a long and heavy lead core bullet that in the 160 class or heavier to take advantage of the 7 twist. The 140's are already going to be a little on the slow side out of a 260 Rem.

As far as "over stability" goes. It all depends on your application. Competition shooters pick the slowest possible twist for the bullets they use. One issue with highly stabilized bullets is they don't "nose over" as they past their peak trajectory which can lead to slightly degraded accuracy and possible terminal performance issues. The other thing about tighter twists is you will loose a little muzzle velocity. Not sure how much.

You can use the 7 twist, it just wouldn't be optimum and if you're going to put good money for a good build, it might be worth considering changing barrels.
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  #54  
Old 09-17-2013, 08:04 AM
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Re: 6.5 ackley Wildcat

How long is the barrel?

I will be starting load development at the end of the month on what we are calling a 6.5 ultra cat. The reamer is based on the 300 rum with a 40 deg shoulder. GS Custom made a 128g HV for us to shoot out of this chambering. 7 twist is what we are running on 30" length. These bullets are going to have a bc around .640. Running them near 4000 fps will make this chambering a legitimate long range contender.

If were not for the GS bullets we would not have done this because of the barrel life and slow powder issues. As well as the problem of conventional bullets not being able to stand the launch.

We may take one of these barrels and run as many as we can to test barrel life. GS is willing to give us the bullets if we document the shot numbers. I am not sure if we want to donate the time and other recourses needed to do that. We will decide later.

Needless to say, I am very excited about this. It has been a long time waiting. I was not going to say anything until we were able to shoot it but this thread seemed like a good time to say something. When we start shooting I will give reports as to how it goes.

Steve
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  #55  
Old 09-17-2013, 09:47 AM
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Re: 6.5 ackley Wildcat

Hey Steve,

Long time no see. What powder were you planning on using in that 6.5 RUM? That sounds a little bigger than Kirby's 6.5 AM. How long is the 128 bullet? I'm going to try out the 308 177's in my new RUM along with some CEB and 230 Hybrids. If they don't work out I'll have about 150 for sale if you're interested.
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  #56  
Old 09-17-2013, 09:46 PM
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Re: 6.5 ackley Wildcat

The bullet is 1.565". Powder is going to be a bunch of trial and error. I have high hopes for Superformance. It may be too fast... we will see. I am very anxious to get going. I have a 1000 hv 177's. So hopefully they do well for you and I will sell you a few hundred.

Steve
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