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7MM wildcats?

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  #22  
Unread 02-11-2010, 11:02 PM
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Re: 7MM wildcats?

Quote:
Originally Posted by nzspearo View Post
Greg Duley (NZ) has made a number of 7mm wildcats including one called 7mm Fatso based on a shortened 338 Lapua - he has an article on LRH about hunting Wapiti in Fiordland (New Zealand) with that rifle. Here is a bit of the text from the article:

....7mm Fatso. This cartridge is based on a 338 Lapua magnum necked down to 7mm and shortened to the same body length as a Winchester Short Magnum. This creates the ultimate Short Magnum giving 7mm STW ballistics out of a lightweight short actioned rifle weighing just over 7 pounds all up including scope. The action on this particular rifle is a trued Remington Titanium with the bolt face opened up, Sako extractor fitted and magazine lengthened. More weight is saved with a Gre-Tan speed lock alloy firing pin and alloy bolt shroud and Rifle Basix alloy housing three lever trigger. The barrel is a 26 inch number 4 contour fluted Lilja with a 1 in 9 twist. The stock is a McMillan Hunters Edge. The Leupold 4.5-14x50 LR Mark 4 sits in those exquisite Nightforce low alloy rings with the titanium clamps on a one-piece alloy base. This picture was taken before I had mounted the lighter scope. The load for the long shots is a 162gn A-Max doing 3250 fps, and the BC works out at .650 out of this rifle. You can push this bullet at 3300 fps but the groups open up to over .5 MOA whereas at this velocity they'll shoot .4 MOA which is pretty good for such a light rifle. For the under 500 yards shots a 160gn Accubond (BC .525) at 3300 fps works superbly, and averages .5 to .6 MOA....

I read that article. It sounds perfect, yet the part about making the brass sounds a bit intimidating.
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  •   #23  
    Unread 02-11-2010, 11:10 PM
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    Re: 7MM wildcats?

    Does anyone know why Kirby skipped the 7mm with AX series?

    Seems like a 7mm-.300 Dakota "Improved" may have merit......
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      #24  
    Unread 02-12-2010, 01:49 PM
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    Re: 7MM wildcats?

    There is a 7mm wildcat that I designed called the 284 STAK that is based on the 300 or 330 Dakota case. It is an IMP 40* with reduced body taper. 3200 plus with 180 Bergers. Works very well but still involves a fair amount of work and $ to do.

    My own 7mm wildcat is called the 7mm RHB and is a shortened RUM case ( 2.555 ) that I designed in 1999 when the RUM brass first became available . It has a 35* shoulder and less taper in the body also. It holds about 3 gr more powder than the 284 STAC and the performance level is about the same. This version is very difficult and expensive to pull off !!!This one is not for the faint of heart!! (or thin wallet) There are pictures and a bit of write up on LRH, probably on one of Goodgroupers threads so you could do a search .

    The 7mm Dakota is perfect for what you stated you are looking for!! Listen to Ernie, he knows what he's talking about!! --- RHB
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      #25  
    Unread 02-12-2010, 02:45 PM
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    Re: 7MM wildcats?

    Thanks. I am now convinced that the 7mm Dakota is the way to go. The last stone for me to turn was to try to duplicate it's performance while keeping the .532 bolt face. Mainly trying to plan for an out if the 7mm Dakota doesn't meet my expectations. I guess I am now prepared to take that risk.


    Just also wanted to thank everyone for their input. I am frequently amazed at the gun IQ on this site. I have not found this level of knowledge at any other site.
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      #26  
    Unread 02-12-2010, 06:31 PM
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    Re: 7MM wildcats?

    Quote:
    Originally Posted by cornstalker View Post
    Is anyone aware of any 7mm wildcat cartridge that will push a 160 to 3200 fps with a 2.50" case? (other than the 7mm Dakota)

    I would like to keep the barrel at 26" max.
    I can come REAL close to that with my case. I shoot 140's in my 6.5 at 3150 and can reach 3200+ (but a little hot) This with a 26" barrel. I'm SURE you could do it with a 28" barrel in a .280 with 160 grainers. In fact, I'm thinking of doing just that when I get my 300 Sherman done,........Rich
    P.S. This is an '06 sized case by the way, not a magnum!
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      #27  
    Unread 02-12-2010, 07:10 PM
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    Re: 7MM wildcats?

    I may have missed the suggestion somewhere along the line, but what about necking down the 338 Norma Mag?

    Chris
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    Ignorance can be treated with education, sadly there is no cure for stupidity.
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      #28  
    Unread 02-12-2010, 09:03 PM
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    Re: 7MM wildcats?

    Quote:
    Originally Posted by elkaholic View Post
    I can come REAL close to that with my case. I shoot 140's in my 6.5 at 3150 and can reach 3200+ (but a little hot) This with a 26" barrel. I'm SURE you could do it with a 28" barrel in a .280 with 160 grainers. In fact, I'm thinking of doing just that when I get my 300 Sherman done,........Rich
    P.S. This is an '06 sized case by the way, not a magnum!
    It would already be a 6.5-06 AI if it had a .473 bolt face....
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