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6.5 ultra mag ballistics?

 
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  #8  
Old 02-27-2005, 11:01 AM
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Re: 6.5 ultra mag ballistics?

Okay, thanks Kirby. I was pretty sure of that but was a little concerned about it for those who were less experienced that visit here.
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  #9  
Old 02-27-2005, 07:55 PM
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Re: 6.5 ultra mag ballistics?

Fifty thanks again, was not trying to infringe on your design, just I am wanting to build a 6.5 rum with a 35 degree shoulder angle with minimum body taper. Your 6.5 Allen Mag seems very close to what I am lookin to build.

D-A
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  #10  
Old 02-28-2005, 12:34 AM
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Re: 6.5 ultra mag ballistics?

D-a,

Yes it is very close to that but let me warn that I would highly recommend not going with the full length RUM case such as the 7mm, 300 or 375 which are longer then the 338 RUM case.

YOu will be limited to using ball powders such as H-870, AA8700 and the very slow surplus powders such as 872. This is not a problem as they work very well btu you will have a powder bridging problem with a shoulder angle of this degree or sharper.

That meaning when fired the powder charge will compress and wedge in the shoulder-neck junction of the case and cause soem severe pressure variations. I tested Retumbo and even H-50BMG in mine and experienced this problem. One shot would show no pressure signs at all while the next would blow the primer pocket.

This is not a problem at all with the ultra slow ball powders listed so keep this in mind, will save you time and headaches down the road.

Now my 270 Allen Mag did not have this problem due to the larger bore, still 8700 works extremely well in this.

Other benefits of the ball powders is they burn much cooler then stock powders and are much less abrasive as they are forced through the throat of the rifle. A major consideration in case life when your burning +100 gr or powder in a 6.5mm bore.

Good Shooting!!

Kirby Allen(50)
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Kirby Allen(50)

Allen Precision Shooting
Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.

Farther, Faster and Flatter then ever before.

Web Page: www.apsrifles.com

allenmagnum@gmail.com
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  #11  
Old 02-28-2005, 11:14 AM
 
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Re: 6.5 ultra mag ballistics?

Kirby,
I have followed your progress on the .257 AM, but didn't realize that you were also working on a 6.5mm. Per our previous discussions, I'm definitely interested in one or both. What kind of numbers do you get when you compare the 257 & 6.5???
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  #12  
Old 02-28-2005, 03:52 PM
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Re: 6.5 ultra mag ballistics?

Nighthunter264winmag,

Basically with the new Wildcat bullets, the two are very similiar. Both have bullets that will hit 4100 fps, both have bullets that will push or exceed .900 in B.C. as well.

The 6.5mm Allen Mag will do anything the 257 version will do with the same bullet weights and add roughly 35 to 50 fps to top velocity levels, or it will push a 5 to 7 gr heavier bullet to the same velocity as the 257.

They are very similiar with the Wildcat Bullets, I designed them both simply because there was no high performance option for the 257 caliber and the 6.5mm is so popular now youwould be stupid not to offer one.

Good Shooting!!

Kirby Allen(50)
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Kirby Allen(50)

Allen Precision Shooting
Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.

Farther, Faster and Flatter then ever before.

Web Page: www.apsrifles.com

allenmagnum@gmail.com
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  #13  
Old 01-20-2009, 09:27 PM
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Re: 6.5 ultra mag ballistics?

What do you mean by no high performance option for the 257
mike
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  #14  
Old 01-20-2009, 11:48 PM
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Re: 6.5 ultra mag ballistics?

Mike,

You really went digging for this old post. Are you looking for things to do?? LOL

My comment was directed toward the lack of commerically available high BC 257 bullets on the market compared to the 6.5mm which has several "good" BC bullets that are easily attainable. At least I think that is what I ment rereading the post. That was a LONG TIME AGO!!!

Take care,
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Kirby Allen(50)

Allen Precision Shooting
Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.

Farther, Faster and Flatter then ever before.

Web Page: www.apsrifles.com

allenmagnum@gmail.com
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