Has there been a necked-up 5.56/6.5 round made?

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Originally Posted by Bimmer

Call me stupid, but I think a .32 or .355/9mm straight-wall (or only very slightly tapered) cartridge based on the .223 would be neat... Kind of a modern day .30 Carbine.

Obviously it wouldn't be good long-range, but it might be a good SBR cartridge.

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Reminds me of the Soviet 9x39. 7.62x39 case necked up to .356 9mm 260gr.

Slow, subsonic for short range sniper rifles or SBRs

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Originally Posted by ABNAK

I hear talk that the U.S. military's next cartridge will be of the 6.5 variety. If they can load one with enough "umph" in a .223 case that negates bolt and magazine changes = cost saver? I dunno......

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Where do you hear these things??

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Originally Posted by Eurodriver

Where do you hear these things??

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Many different places to include here on M4C. Not that it's going to happen anytime soon, but that if/when a new cartridge is adopted it would likely be of the 6.5 variety (not in a necked-up 5.56 case, that was a question I was asking).

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Originally Posted by ABNAK

Many different places to include here on M4C. Not that it's going to happen anytime soon, but that if/when a new cartridge is adopted it would likely be of the 6.5 variety (not in a necked-up 5.56 case, that was a question I was asking).

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That died with the interim combat rifle. There is zero reason to incur a weight penalty with a heavier round than 5.56 when you can't even produce soldiers and marines who are capable of utilizing that extra capability.

.25 caliber is the right balance.


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