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Sammy
Lv 5
Sammy asked in SportsOutdoor RecreationHunting · 4 years ago

Can 5.56x45 brass be necked up to 357?

Update:

To use in an AR. .223/5.56 brass has been successfully necked up and down for years, from .17 Remington to .30 Blackout, Whisper, etc...

Update 2:

How can so many have completely missed the point? Or are you all just yankin' my chain?

Update 3:

.357 is the diameter of a bullet, nothing to do with case dimensions,.

Update 4:

Most of you are limited, ignorant. I'm sorry I asked.

Update 5:

How difficult would it be to modify my AR boltface to accomodate a rimmed handgun cartridge?

Update 6:

Impossible.

Update 7:

Ever hear of a Win 351sl in a 1907 semi-auto rifle?

Update 8:

Ever hear of a Win 351sl in a 1907 semi-auto rifle?

Update 9:

Ever hear of a Win 351sl in a 1907 semi-auto rifle?

13 Answers

Relevance
  • Amy
    Lv 6
    4 years ago

    5.56 rim diameter is .378.

  • Anonymous
    4 years ago

    AYAOMTHGDB.

    Source(s): idiot
  • 4 years ago

    5.56 rim diameter is .378.

    .357 rim diameter is .440.

    Necking up is not the only issue.

  • 4 years ago

    5.56 rim diameter is .378.

    .357 rim diameter is .440.

    Necking up is not the only issue.

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  • 4 years ago

    No....

  • 4 years ago

    That depends if you like the way your face looks, or if you would rather look like Michael Jackson!

  • 4 years ago

    This one is a reloading instructor. That you ask this question and add no details - tells me you are going to have a visit to the Emergency Room in the near future so doctors can remove pieces of blown up pistol from you face and hands.

    A rule with NO EXCEPTIONS: "When reloading - if the practice and procedure is not written in black and white in a reloading manual, do not do it".

    Gun shops all over America are decorated with blown up guns from guys who have a 'great idea'. I have been making my own ammo since 1978 - I have never 'blown up' at the range. I love shooting and the shooting sports. My friends who have had a 'bright idea' or were 'careless' and blew themselves up at the local range...... they don't shoot any more.

  • 4 years ago

    5.56 rim diameter is .378.

    .357 rim diameter is .440.

    Necking up is not the only issue.

  • 4 years ago

    It would be essentially straight-walled, with no shoulder for headspacing. Sure, you could, but it's hard to figure a reason for doing so.

  • BBean
    Lv 7
    4 years ago

    Possible. Not practical. You would have to trim the case to somewhere around 1 7/16" length. Expand the case to acquire about .375"-.380" shoulder diameter making a straight wall rimless cartridge. You would have tad longer case than a .357 Magnum. Not a good move.

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