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6.5 ulta mag

 
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  #1  
Old 12-07-2006, 12:32 AM
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6.5 ulta mag

I found some info about a 6.5-300 ultramag. The guy is calling it the 6.5 ultracat. Does any one have any thoughts about this wild cat? I kinda have a thing for overbore cats. I know the 6.5-284 and 6.5-06AI have a great reputation, but they just are not SEXY enough. I dont want to jump on the wsm band wagon either. Any thoughts? Any body tried necking down the 338 Lapua? Im looking for 140 at 3500fps or better.
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  #2  
Old 12-07-2006, 04:38 AM
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Re: 6.5 ulta mag

There is a guy that posted on this board a few years back that used a 300 Wby necked down to 6.5. Its one fast flat shooting cannon. Barrel life is very short.

There were a few guys at Williamsport using the 300 Wby necked down to a 6.5 as well. I'm sure if you search the boards someone is using the "6.5 ultra".

AG
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  #3  
Old 12-07-2006, 05:15 AM
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Re: 6.5 ulta mag

I have a 6.5-300RUM. I love mine. It shoots a Barnes 120XLC at 3850 fps. I have not tried any other bullets in mine because the Barnes shoots one hole groups at a 100yds and 3/4" groups at 300yds. I think the speed of the 140gr that you are looking for is reasonable.


I have killed two deer with mine and it performed awesome! This past weekend I was able to do a little long range shooting at 750yds. I was shooting at a life size deer target and even though the wind was blowing harder than I would had liked and this being the first time I have tried shooting anything past 300yds, I got one 3" group a 1/2" off the deers nose. After that I adjusted for the wind and hit the deer in the shoulder and neck, I was pretty happy [img]/ubbthreads/images/graemlins/grin.gif[/img].
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  #4  
Old 12-07-2006, 09:32 AM
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Re: 6.5 ulta mag

Shawn68,

The 6.5mm RUM is about as large a powder capacity as you can use and still be somewhat practical in the results. My 6.5mm Allen Mag is based on a blown out, improved 338 RUM case so it is shorter by 90 thou then what a 6.5-300 RUM would be but its capacity is basically the same.

I went with the shorter 338 RUM case so that it would give me the same capacity but in a shorter case allowing me a better OAL for a repeating round.

Our current 6.5mm AM has a 30" Lilja 1-8 twist and it is my wifes long range rifle. We are using a relatively mild load to get a legit 3540 fps with the 142 gr ULD RBBT. This is only a temporary load as I have some prototype 168 gr ULD RBBTs coming from Richard Graves of Wildcat Bullets to test in this big 6.5mm.

As others have said, it is also my opinion that anything lighter then 120 gr of bullet weight is really a waste of time in this type of round. The 120 gr X bullets are a pretty good choice as they are much longer then a conventional 120 gr 6.5 bullet and will obviously like the velocity potential.

I still feel that for long range consistancy, nothing helps these large capacity small bore rounds like alot of bullet weight.

Simply put, with todays powders and bullets, this is a practical chambering, just do not use it for a varmint rifle or you will be rebarreling it every season!!! [img]/ubbthreads/images/graemlins/grin.gif[/img]

As a big game rifle, they will last many seasons easily.

Good Shooting!!

Kirby Allen(50)
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  #5  
Old 12-07-2006, 10:13 AM
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Re: 6.5 ulta mag

[ QUOTE ]
Im looking for 140 at 3500fps or better.


[/ QUOTE ]

If that is all you want, the 300 RUM with a 155 AMAX or Scenar is capable of delivering 3600 FPS+ with good BC's. I have personaly tested the scenars at over .500

The benefit here is barrel life. The bbl life with the 6.5 RUM will be incredibly short. The 300 is short enough.
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  #6  
Old 12-07-2006, 12:02 PM
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Re: 6.5 ulta mag

No kidding!
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  #7  
Old 12-07-2006, 06:58 PM
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Re: 6.5 ulta mag

Yeah but with good cleaning practices and practical shooting, "let it cool down", cant some one dictate how long the barrel will last. Or are you guys thinking that it would be hard to stay on top of the throught erosion?
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