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I've been thinking about designing the ultimate wildcat cartridge, and I think I've got it.

The requirements are:

1. Good power at normal game hunting ranges

2. Good trajectory with reasonable recoil

3. Ability to chamber in standard length actions

4. Good bullet weight range, availability and quality

5. Dimensions that provide reasonable bolt thrust

6. Excellent feeding from magazine

7. Adaptable to all rifle actions


I settled on a design that will handle bullets weighing from 55 to 250 grains. It will also
provide velocities up to 4000 fps in lighter bullet weights and from 2400 to 3000 fps in normal hunting weights.

With a 200 yd zero, it drops only 6.5" at 200, and is 1.5" high at 100. It will carry one ton of energy to 500 yards.

It does not have a belted or rebated rim, so it feeds like a dream. It uses a standard base dimension, so you can load 1 up and 4 down in a standard bolt-action rifle magazine.

The bolt thrust is only 64% of a standard-base magnum round.

In actual testing, it has proven that it can "poleaxe" any game animal on the North American continent and will also handle 99% of African plains game.

Now, what to call it...............

Well, ever since Holland and Holland came up with the .300 H&H Magnum, I guess it's going to have to have the designation "Magnum" in it's name.

"Ultra Mag" is already taken
"Short Mag" is, too (isn't that an oxymoron?)
"Short action ultra mag" is used
"Super-Short mag" is, too
Hornady gave us the "Light Mag" (????????) and the "Heavy Mag"

So, here it is...........the "7.62 MM Slim Mag"





You know, quickdtoo said I should call it the .30-'06. I said " Heck, it's got to have a metric designation so we can pacify the rest of the world..........and it's 2007, not '06....what the ****?

;D ;D
 

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Cool idea!

Could you shorten that long thing up a little? That way it'd fit in the short action? Maybe we could can it the .308Winchester or something?




Scott (like your thinking) B
 

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you are smok'n joe but what ... a 55grn 308 bullet ??? i'm in the market to build a cat myself if you can get a hold of the 11th edition of C O W look up 250 humdinger there is a small write up on it .. it was original built by a photographer sports writer 10yrs ago briel jackson... this has almost all of your requirements , short action 308 case in 25 ca. ...l this is smoken
25 souper improved improved' 45* shoulder. walls are blown out to .461-2,.. rather then necking down a 308 case it seems to be easier to neck up a 243 case with a 257 die an then form fire it to the chamber .. a quick load program says it reaches 54000psi an at max gets to 3100 fps with a burger 120 ..re-19 / 48.5 out of a 23-1/2" barrel 1-10 tw, the col. data needs to be found after being built its only after the reamer are located, has a lead to throat .106.. i think that includes free bore, the neck will be short on the case,, so how far i can stick out the bullet i won't till it was put together.. most of the info came from a pre built winchester in 1998, so far only 4 know made i'll be working with a 700 remington action which has a recest bolt face i don't know if the winchester has a flat face or not... don't know if it would make a difference either ?
 

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Like minds must think alike, I have two rifles chambered for this ultimatewildcat, to use the 55 gr bullets you must use a sabot, and you can indeed get 4000 fps from it, I like this cartridge, especially with 165 gr Barnes TSX bullets......JimP. ;D
 

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:D ;D :D

I guess I'll be shooting a 7mm short slim mag this year.
I have been thinking my next rifle should be chambered for the the old stand by.
 
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