FN unveils the 6.5CM Mk48

[revchuck38]

The 260 Remington was never developed with any military use in mind.

True. It was designed to be housed in a full-stocked, 20"-barreled bolt gun. Any other use is blasphemous.

[Mjolnir]

I don't understand the rationale for 6.5 CM in a machine gun. It can't be accuracy/precision or extension of range. I would think the 7.62 would be more robust against barriers. Of course it is marketed towards special forces, so it probably mission specific.

Flatter shooting, longer range and higher sectional density PLUS 25% less perceived recoil and much greater hit probability than 7.62 NATO.

The only drawback will be barrel life compared to 7.62 NATO


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[Mjolnir]

Surprised they went with 6.5 CM and not 260?

I thought the purpose of the 260 was better feeding in machine guns?

The BULLET sits deeper into the case on .260 Rem which can cause accuracy issues as the power would be touching the projectile on longer cartridges.

Or so I’ve read.


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[ragnar_d]

No doubt.

Perhaps I mis-remember but I seem to recall seeing somewhere in a 260 vs 6.5 CM discussion that the 260 was "friendlier" to automatic fire. Perhaps I got it backwards.

Might be that .260 Remington is a .308 based round so it could (would?) be an easier conversion from one to the other vs. the 6.5CM being based off of the .30TC. Just a guess on my part, I've been out of the machine gun & rifle building game for a minute.

[EMC]

Might be that .260 Remington is a .308 based round so it could (would?) be an easier conversion from one to the other vs. the 6.5CM being based off of the .30TC. Just a guess on my part, I've been out of the machine gun & rifle building game for a minute.

From what I remember of this soldier systems article, the decision to go with the creedmoor was somewhat arbitrary as the 2 cartridges performance in SOCOM testing was really close. It seems they went with what made more sense from an industry support perspective.

http://soldiersystems.net/2018/03/23...adopts-6-5-cm/

[DocGKR]

Correct--both had advantages.

[TiroFijo]

From what I remember of this soldier systems article, the decision to go with the creedmoor was somewhat arbitrary as the 2 cartridges performance in SOCOM testing was really close. It seems they went with what made more sense from an industry support perspective.

http://soldiersystems.net/2018/03/23...adopts-6-5-cm/

The 6.5 C has a bit lower velocity due to slightly smaller case capacity (shorter case), but allows the use of a bit longer/heavier bullets since both have the same OAL. It seems the possibility of using longer VLD bullets in the future tipped the scales in favor of the 6.5 C.

[Clusterfrack]

Yes, if mag length is a limitation, 6.5CM is the way to go. Personally I prefer .260 in a bolt gun. More capacity, and feeds better. I get 2850fps with a 142gr bullet from a 24” barrel.

[Alpha Sierra]

The BULLET sits deeper into the case on .260 Rem which can cause accuracy issues as the power would be touching the projectile on longer cartridges.

Or so I’ve read.


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Not so. Compressed charges, by themselves, are not the cause of any inaccuracy.

[revchuck38]

Not so. Compressed charges, by themselves, are not the cause of any inaccuracy.

My understanding is that a full case of powder is a good thing, since the powder can't re-position itself which can cause erratic ignition.