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  #1  
Old 06-22-2011, 10:27 PM
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Rem 6.5mm Mag wildcatted !


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Hi all,

I have had an idea for quite a while now and can't seem to get it out of my head. I would love to hear any comments good or bad and any advice on the subject. I really like the .25 bore rifles and have thought of an idea for a gun i would like to have made. It's the Rem 6.5mm Mag Ackley Improved with a 40 degree shoulder and blown out with no body taper, then necked down to .257. Go with a .308 length action and 27-28 inch barrel. I think as long as pressures stay safe it would run with the .257 Wthby or at least be right on it's heels. Looking forward to the comments and Thank you Sources such as Lymens and Weatherby's pressure rating suggest max of 66,000psi and CIP limits to a max of average pressure of 64,000 psi. The max pressure for the 6.5 list at 63,100 psi and maximun CUP of 53,000 CUP. The 6.5 has a case capacity of 68 gr H2O and the weatherby's case capacity is 84grs of water. The case capacity should be able to close the gap quite a bit, again Thank you

Last edited by fred243; 06-22-2011 at 10:49 PM.
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  #2  
Old 06-23-2011, 03:18 AM
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I suppose you are planning on it being a single shot, because I think you would have all kinds of feed problems trying to magazine feed .

I'm also guessing you don't mind having a new barrel installed every 1,000 rounds or less,

Wildcats are how we've gotten most of the rounds we shoot today. Somebody would have the balls to take and idea and run with it, working on it until they got the bugs out of it.
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  #3  
Old 06-23-2011, 04:16 AM
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I love wildcats as much as the next guy, but if you're motivated to try and get 257 Weatherby velocity out of a 2.1" case, you would be quite a bit farther ahead to start with an action designed for something like the 300WSM. Put on your 25 caliber tube, neck down and probably neck turn some 270 or 300 WSM cases...and you're all set. Why complicate things by using a parent case that is belted and not as easy to find as the WSM line? You'll get about the same performance, either way. Find someone who has necked down the 270WSM to 25 and you will save yourself a lot of time, cost and headache.

When it comes to wildcatting...it's all been done.
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  #4  
Old 06-23-2011, 05:49 AM
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fred243, I like your style IMHO a true wildcatter always thinks out of the box. The first question I ask myself is what if I change this it can be just the barrel or case and whats the end results.

I think you can add barrel length,change twist,type rifling and do better than published velocity and the same thing happens with wildcats even ones that been done before.

They have done a 25/350 Rem mag 117gr bullet @ 3400FPS which is Wby velocity so your not far from what you were thinking almost 73gr h20.

If your an experience wildcatter and have the right tools forming isn't all that bad. If your not maybe build a 25-06AI or 25 Gibbs with a 27"/28" Mike Rock 5r 1/9 twist barrel for throated for the 115gr up to 120gr bullets.

Well good luck
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  #5  
Old 06-23-2011, 11:19 AM
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When the 350 Remington Magnum appeared the gun writers necked the cartridge up, down and sideways.
A local gunwriter named G.O. Ashley favored the 350 necked down to 8mm and he wrote several articles about this wildcat.
In the May 1965 issue of Shooting Times Dave Wolfe (father of Handloader and Rifle magazines) and George Nonte wrote an article titled “Fine, Feral Felines” about wildcats based on the 350 Remington Magnum. There is a pictured line of wildcats based on the cartridge including .224”, .228” .243“, .257”, .264”, .277”, .284”, .308”, .323”, .338”, the standard .350”, .375”, .410”, .430” and .450”.
Loading data is included for the .264”, .284” and the .308” wildcats. The article is five pages long and has more informative than a feature article in one of today’s gun magazines.
There were at least two articles in the Gun Digest about 6.5 Rem Mags built on long actions. The pet peeve of the late 1960’s was about seating the bullet bases below the shoulder.
It’s been done but finding an article with in-depth information will be a challenge.
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  #6  
Old 06-23-2011, 04:27 PM
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I like the general idea, fred. Not sure if you're eyeing this project for use with the lighter or heavier 257 bullets, but that decision would lead me towards some case and action decisions.

For example, if tending towards lighter bullet use like 75 or 87 gr, I might stick with the stock 6.5 RM case without blowing it out at all. You are going to get good velocity already with that case and the lighter bullets (I get 3500 fps with 75 gr Hornady HP's out of my 25-06). And, these bullets don't take up much case capacity when limited to OAL in the short action.

If your wants are toward the heavier bullets then I'd consider an intermediate or long action (as broom mentions), and even then maybe still use the stock case. One of the persistent complaints about the Rem 600/660 actions (any short action, really) is that they do not feed the fat cases smoothly. And blowing out the case may make this worse. The Rem 673 did improve feeding compared to the 600/660 and may be a good platform to start with. I believe Ruger chambered the M77 in 350 RM for awhile; not sure if they still do.

Anyway, even though 'it's all been done before', it hasn't been done by you, and that's where the fun is at. Good luck.
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  #7  
Old 06-23-2011, 06:28 PM
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Since the 6.5 RM has about the same case capacity as a 30-06 case if it was necked to 257 it should be the same as a 25-06. The improved version would probably be closer to the 25-06 IMP than the Weatherby.
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  #8  
Old 06-24-2011, 02:50 PM
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I'm with trailblazer. It would be very close to the 25-06 Ackley Imp. 40.
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  #9  
Old 06-25-2011, 07:01 AM
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...and slightly behind the 25WSM.
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  #10  
Old 06-25-2011, 01:43 PM
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I knew i joined this forum for plenty of good reasons and is the only one i belong too. You guys are really good and very knowledgeable. There's plenty of great input and advice here for me to think about. Being honest i never really thought about chambering issue's, i just really like being different and love the idea of using the original short mag in the 350RM or 6.5RM. There's no doubt broom that starting with either the 270WSM or 300WSM would be much easier. I welcome more advice, and or suggestions from all. What i would REALLY love to have is a McWorter Rifle chambered for the 6.5mm Weatherby Mag, very very sweet. Thank you all again and anymore help would be greatly appreciated.
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  #11  
Old 06-25-2011, 03:35 PM
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I like the Rem Mags for their intended purpose, a short powerful rifle for boats, planes and snow machines. The rifles fill a need.
My pal Fostule could make these wildcats up using a neck reducing die and using a Vickerman seater.
I knew I had the article but had to hunt for it. Here are the pictures.



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Old 06-25-2011, 05:47 PM
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Hey Slim, thank you for the pictures they are very cool. I haven't been able to locate the exact aritcle you wrote about above but did come across one on the 6.5RM written by Bob Steindler for the May/June 1966 issue of Handloader Magazine. It's a really good article i came across just by googleing to try and find the one you are talking about. I'll keep looking though and thanks again.
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  #13  
Old 06-25-2011, 05:58 PM
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Great post William. I imagine that anything 243 and smaller is quite the barrel-burner, but that's a routine fix these days.
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  #14  
Old 06-25-2011, 08:11 PM
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Neat. I like the looks of the .430" version!
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  #15  
Old 06-26-2011, 05:43 AM
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I like the 350 as it is! Just something about the .35ís that pleases me.
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  #16  
Old 06-26-2011, 07:16 AM
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#8 .458 version looks like the .416 Remington Mag, they all look pretty cool !! @ Shawn, so with the increase levels of chambering issue's would you use a single shot bolt or break open action ?
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  #17  
Old 06-26-2011, 07:07 PM
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Depending on how much you want to put into the project, a drop-block action (Ruger #1 or Browning 1885) would be nice platforms.

On the less-expensive side of a project, are you thinking a break-open action like the H&R Handi rifle? That might be a good option to wring out the potential of the cartridge and if you like it, try it in something more 'upscale'? Honestly though, I don't know if the Handi is chambered in something that can be reamed to your cartridge, or if there are aftermarket barrels even offered that can be customized.

A Mauser 98/VZ.24, or even the shorter Yugo action would be something to consider. I had a 416 Taylor (458 or 338 Win mag cases) built on a Mauser 98 and it feeds just fine. With a blown out case, there may be some rail modifications needed, but with CRF, and the short case, I think you could get it to feed fine in one of these actions.
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Old 06-26-2011, 09:48 PM
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Yeah, I was thinking about the H&R Handi Rifle. I'll check out the Yugo action, i'm really not familiar with it, I do like CRF's though.
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Old 06-28-2011, 06:23 PM
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Which one would create a bigger chambering issue, the reduced body taper or having a 40 degree shoulder ? Or would it be both equally ? Would having a 30 degree shoulder instead help ?
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  #20  
Old 06-29-2011, 03:13 AM
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The H&R SB2 frame is great for making wildcats on, especially using a rimmed parent case, but they are not designed to handle the ~60,000psi of a belted magnum. The Ruger #1 would be an excellent choice.

I like the .323" version, although today you have the 325WSM factory offering that isn't stuck with a belt.
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