Pondering the "magic" caliber.

Discussion in 'General Gun Discussions' started by SSN Vet, Jul 15, 2021.

  1. Hugger-4641

    Hugger-4641 Member

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    I kind of think you missed one. In my mind, the 7.62x25 is really just a necked down 9mm, but since the 30 Mauser was first, I guess my opinion may not be historically correct.
     
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  2. Meeks36

    Meeks36 Member

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    232677F4-286B-4A34-8C8C-3B64244A1641.jpeg
    How about 41 mag?
     
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  3. Hugger-4641

    Hugger-4641 Member

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    I wonder how long/heavy a bullet you could load if you necked the 10mm down to 7.62/.308 instead of .357 ?
     
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  4. Hugger-4641

    Hugger-4641 Member

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    I like the OP's question and have thought about this myself. So I'm thinking a pistol and a carbine that could both use the same cartridge and same 10 to 15rd mag would be great. I have a PCC 9mm for this reason. But I want the carbine to shoot a 150gr bullet at 2600fps and the pistol to be able to shoot the same round at 1600 or so:)
     
  5. Robert

    Robert Administrator Staff Member

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    45 Win Mag?
     
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  6. Hugger-4641

    Hugger-4641 Member

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    Performance would fit my bill in the pistol, but do you think a carbine could push a 160ftx to 2600 or more?
     
  7. Robert

    Robert Administrator Staff Member

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    I honestly don't know.
     
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  8. mokin

    mokin Member

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    Dangit! Now that's going to be on my mind.

    I purposely left the 7.62 x 25 out because (probably subconsciously) I was focused on .35 caliber bullets. Now I'm going to have obscene images of long skinny things going through my head.
     
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  9. mokin

    mokin Member

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    Those are impressive numbers. Anybody know what a .357 AMP can do?
     
  10. Demi-human

    Demi-human Member

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    I would like something like a Deerfield .44, but in .50. Bonus points for using Desert Eagle magazines.
    I have the Desert Eagle for the pistol…:)
     
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  11. mokin

    mokin Member

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    Since you put numbers up, and the idea of a .30 caliber bullet in my poor noggin, a round nose projectile for the 30-30 came to mind. Because my Hornady manual was handy, #3035 weights 150 grains, has a ballistic coefficient of .186, and the muzzle velocity range is listed as between 1800 and 2500 fps. Those numbers are close to what you describe. I didn't find any handgun bullets that seemed to match as closely. Then again, I just looked at Hornady. The trick is to figure out the rest of the cartridge and something to shoot it with.
     
  12. SharpDog

    SharpDog Member

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    It's called the .357 Sig.
     
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  13. Meeks36

    Meeks36 Member

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    10mm mag
     
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  14. SSN Vet

    SSN Vet Member

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    That would be the sweet spot :thumbup:
     
  15. Bfh_auto

    Bfh_auto Member

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    I agree .
    Also the only way it would be a viable option for 357 would be if they offered 357mag rimless. Kind of like they do the 45 auto rim brass.
    That leaves us with 38 Super as another viable option.
     
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  16. .38 Special

    .38 Special Member

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    I had some vague memory of a rimless .357 (turns out it was the .357 AMP, mentioned upthread) and came across the .357 Rimless. I have no idea if the thing is available (or if everyone but me knows about it - I don't follow AR-15 developments at all) but it looks like another candidate for the OP's list.
     
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  17. FROGO207

    FROGO207 Member

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    Just give up and go with a 44 AMP.
     
  18. Phaedrus/69

    Phaedrus/69 Member

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    I think the 9x25 Dillon and .40 Super would both be pretty interesting chambered in an AR. The bottleneck cartridge should feed well and some pretty impressive velocity would be possible out of such a carbine.
     
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  19. earlthegoat2

    earlthegoat2 Member

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    There are a few gunsmiths who have done conversions of Marlin 336s to 50AE and possibly 500 Linebaugh. I am not sure of the ballistics though.

    Personally, the idea of a common round that shoots 2600fps from a rifle and 1600fps from a pistol seems like a lofty goal with even loftier expectations of the laws of physics.
     
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  20. Demi-human

    Demi-human Member

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    I agree. A hundred feet per second per inch of barrel is, optimistic. Especially so in a straight walled cartridge, or a cartridge that still fits lengthwise in one’s hand.
     
  21. Hugger-4641

    Hugger-4641 Member

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    Yep, nobody said what we want is actually possible, but we can wish.
     
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  22. earlthegoat2

    earlthegoat2 Member

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    I suppose I would also want the case length to be an inch or less…
     
  23. JohnKSa

    JohnKSa Moderator Staff Member

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    A really careful look at the 10mm reveals that it and the .357Mag are virtually clones. The 10mm tops out a bit higher for momentum with heavy bullets. The .357Mag tops out a bit higher for energy with light bullets. But the differences are small. Over most of their performance range they are very similar.

    That's in handguns. In longer barrels, the .357Mag does seem to have an advantage, but probably not enough to justify it over the benefits that a 10mm would provide in an autoloading design.
     
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  24. LNK

    LNK Member

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    What about 5.7x28!
     
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  25. Pelo801

    Pelo801 Member

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    With the 2600 fps/1600 fps criteria, you might get that out of a 10mm using 135 gr bullet. But I think thats a light for cartridge weight bullet. I would be ok with a 175 ish gr bullet at 1400 fps out of a pistol and maybe 1900 fps from a carbine length barrel.
     
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