Just had a neat idea 9x45mm

Discussion in 'Rifle' started by spamassassin, Mar 26, 2017.

  1. spamassassin Well-Known Member

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    Consider this, take a 5.56x45mm/.223rem case, anneal it, open the front up to 9mm and launch 147gn 9mm bullets at something like 2200-2400fps (my estimate). It'd be legal for hunting in states that require straight wall cases and should be able to slap the snot out of a hog or deer or coyote and would be straight devastating against 2-legged varmints with 124gn pills at 2500fps. The bullets wouldn't penetrate deeply if they were non-bonded expanding type but the temporary cavity would be about the size of a basketball. Bonded bullets would be able to get much improved penetration but at those speeds I predict bullets would come apart anyway. FMJ's though would probably deform quite a bit themselves and still penetrate hard.

    I know about the .351WSL and it's kin and .358 Herret but those are really looking at using proper rifle bullets. I'm thinking about this as designed to use pistol oriented bullets similar to a .30carbine. In fact, this would be not much else but a bigged up .30carb though the pressure peak would be nearly twice as high meaning much higher performance levels.
  2. boostless Active Member

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    Sounds like it'd be a fun plinking round, I find my AR9 to be a fun and cheap form of stress relief. If a manufacturer developed hunting/defense bullets it would be even better, unfortunately I don't really see that happening. Although it would be interesting to see how the current bullets would perform at those speeds.
  3. GrocMax Active Member

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    Jun 12, 2014
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    Necks get real thin above 25 cal.

    25x45 aka 25-45 Sharps
    25TCU
    6.5TCU
    6.8TCU
    7TCU
    8TCU?
    7.62x40
    338-223 straight

    Pretty much anything you can think of has been done. I bet someone over at Castboolits has already done exactly what you're thinking.
  4. boostless Active Member

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    That 338-223 looks pretty interesting, hell they all look interesting. I know I wouldn't stick with them very long though.
  5. GrocMax Active Member

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    Prvi makes cheap and decent brass for 7.62x39 and 7.92x33 Kurz. Kurz is .470" diameter rimmed with a .450" shoulder.

    Never heard of a straight wall case requirement hunting rule? Is this an addition to special seasons aka shotgun/muzzleloader/bow?
  6. boostless Active Member

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    No, just the limitations in some areas. Kind of like some places you can hunt with a 223 and some places you can't. I guess the ideas is that those cartridges don't have a high velocity and don't have to worry about how far they will travel.
  7. spamassassin Well-Known Member

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    ^^^ Yep. Insane rules. IIRC Indiana is one of the affected states. Could be wrong about the particular state, not looking it up right now.

    The guys over at CB have done it but they seemed to be looking for more case than I am. Case neck thickness is an issue but cutting further down the case seems to help. Headspacing on the case mouth is the big problem.

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