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Military Guns and Ammunition

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This is intended for people interested in the subject of military guns and their ammunition, with emphasis on automatic weapons.

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US SOCOM's MRGG project   General Military Discussion

Started 12-May by BruhMomento; 1934 views.
Guardsman26

From: Guardsman26

21-Jun

The SCAR popped-primer problem is simple to explain.

First, many commercial loadings of 6.5 mm Creedmoor use soft primers, because these are cheaper than hard primers. Since SCAR was designed for military spec hard metal primers, this was always going to be an issue.

Second, a specific SCAR requirement was the over-the-beach-test and therefore the firing pin was designed to ensure it connected positively with the base of the primer in the presence of water.

Third, FN America quality standards seem to be less than its European HQ. It released the 6.5 Creedmoor before it was fully ready. Unforgivable. FN America needs to get a grip of this issue, not least in communicating better with its non-military customers. Overall, I think the SCAR is an unmatched 7.62 mm battle rifle, especially the SCAR 20 / HPR. It has matured very well over the last decade and the extent to which it is used among SF units is a testament to this. (BTW It won the French tender, but its bid was disqualified due to an inexperienced sales executive.) 

SCAR is not done yet. It's just getting started. 

gatnerd

From: gatnerd

22-Jun

Guardsman26 said:

The velocity could easily be increased to 1,000 mps for better body armour defeat in a standard brass cartridge. 

I'm skeptical of that.

These were the Quickload specs I had done awhile back. These were with a lead core bullet; I suspect velocity would be a bit lower with a EPR due to reduced case volume from the longer projectile. 

6.5C 123gr@ 62kpsi

16”- 2795fps / 852m/s

20”- 2962fps / 902m/s

6.5C 123gr @ 75kpsi

16" 2960 fps / 902m/s

20" 3124 fps / 952m/s

6.5C 123gr @ 100kpsi

16" 3128 fps / 952m/s

20" 3279 fps / 999m/s

  • Edited 22 June 2022 0:39  by  gatnerd
gatnerd

From: gatnerd

22-Jun

Mr. T (MrT4) said:

Actually I am a bit surprised that 6.5 Creedmoor was chosen over .260 Rem , a design that is far better suited for automatic weapons and also has a bit more boiler room and can push bullets to higher speeds

6.5C was chosen as it had more Ogive space for use with heavier weight projectiles / experimental future projectiles:

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

roguetechie

From: roguetechie

22-Jun

That's fitting considering neckless looks more and more viable (even brass case because of our man emeric) so of course we'd pick one with more ogive space right as more ogive space stops being a problem.

Yup, that sounds about right...

I cannot even at this point.

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