223-243 Wildcat?

Slowbalt

Slowbalt

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Hey all!
At work today I had one of those silly ideas... My own wildcat :D As some of you already know I am in the market for a military style, unrestricted rifle for use in the bush, however the hunting regulations in my area requires a centerfire, 6mm or larger bore. Now, there are lots and lots of very interesting rifles out there, XCR, M96, Sig Special, Tavor, Etc... But all of them are .223. So I thought : would it make sense ( and physically possible ) to take one of these rifles, have someone make a barrel for it with a 6mm bore, and enlarge the .223 neck to take .243 bullets, while using comparable pressure levels overall round lenght and such ? Now I know it would be costly, and that the final result will not produce 5000 lbs/ft( just kidding with that number ) but could it be done without changing all of the internals of said rifle ???

P.S. No it isn't money wise, but it might be a lot of fun:D
 
It's already been done.....the 6x45mm.....don't know where you would get chamber reamers for it.....this wildcat came out in 1965, not many wildcat combinations haven't been tried and many years ago.
 
dan belisle said:
true. I have a 22-243 middlestead that just makes gophers disappear. - dan
Click to expand...

Makes big holes in coyotes as well, at least the few I shot with it did. I have 2 barrels fitted and chambered for my XR100, a 1-14 and 1-8. The 1-14 was supposed to be the fire-forming barrel but shot too good to take off. I still don't know how the 1-8 Lilja shoots.:redface:
 
Yea, there's truly nothing new in the world of wildcatting - some catch on, and some don't, but they've all been tried give or take a few thou differences in lengths and shoulder angles.

The 308 seems like the largest practical case for the 22 caliber with available powders, like the 30/06 is for the 243, and the 300 WM for the 6.5mm.
 
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The problem with the 6 MM/223 is that when loaded to an OAL that will fit inside an AR 15 magazine, the bullet selection is limited to light 6mm bullets. In a bolt action, where you can seat the heavier = longer 6 MM bullets out long, this cartridge makes a lot of sense.

.300 Whisper is a cartridge that ovecomes the limited bullet selection available when necking .223 cases up to 6/6.5/7 MM, and still be useful in an AR 15. If the 223 case is shortened to .221 Fireball length, this allows longer bullets to be used. .30 Caliber bullets up to 240 Gr are used in the .300 Whisper, and still fit and function insude an AR 15 magazine and action.

look up .300 Whisper on the internet for some basic information.
 
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