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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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PDW again   Small Arms <20mm

Started 20/12/20 by DavidPawley; 40607 views.
Mr. T (MrT4)

From: Mr. T (MrT4)

26/2/21

So French Gign went for the Bren in 7.62x39, Brit Met SC019 for MPX in 300BLK and now the Belgians for the Scar in 300BLK , its kinda ironic that Euro Police is going for 7.62x39 and its deranged transgender cousin the 300BLK  to match the criminals with 7.62x39 

renatohm

From: renatohm

27/2/21

Some police units here in Brazil use 7.62 NATO against bad guys, some of which have been using 50BMG once in a while...

poliorcetes

From: poliorcetes

28/2/21

Those pesky maconheiros... but situation is not as bad as it was, right?

In reply toRe: msg 276
graylion

From: graylion

3/3/21

So I did a bit of tinkering. I can get a 35grain projectile to like 3850 ft/s v0, but the ballistics are so abysmal that at 100yds it is 3150 ft/s and 2850 ft/s at 150 yds.

good enough for a PDW I'd say?

roguetechie

From: roguetechie

3/3/21

That's actually not horrible. Since you're going to be limited by bullet length pretty hard you may be forced to accept pretty hellacious velocity drops out at range.

But with a pdw you're mostly trying to be a credible threat past 100 not an actual threat.

That gives you some latitude.

Also, that monster 3850 up close is going to make for something pretty killy even with kinda lame but cheap projectile construction.

In reply toRe: msg 278
graylion

From: graylion

4/3/21

so we have the gun. I haven't done the twiddling of swept bore vs external ballistics again, but will guesstimate at something like .25.

So we have the gun and ammo. The first 200 are delivered to the Elbonian Army for first trials. What happens?

oh, COAL is 40mm, case length is 25mm, base diametre something like 12.5 mm, magazine size 35

 or so.

  • Edited 04 March 2021 17:05  by  graylion
graylion

From: graylion

5/3/21

roguetechie said:

That's actually not horrible. Since you're going to be limited by bullet length pretty hard you may be forced to accept pretty hellacious velocity drops out at range.

Bullet length is 20mm. I need to make it this light to get the speed. So a hardened steel core and polymer for the rest of the bullet body.

In reply toRe: msg 280
graylion

From: graylion

6/3/21

I think it is worth revisiting rate of fire. Sorry just watched one of Ian's videos ;) https://youtu.be/FAIyQ5yqVu8 And it seems that either slow or fast are sweet spots. And given that this gun has some recoil, I think slow is the way to go. 450 RPM?

Also, how likely are people to use it in some kind of full auto? Badly trained REMFs being surprised?

stancrist

From: stancrist

6/3/21

I am inclined to vote for a fast cyclic rate with 2-rd (or perhaps 3-rd) burst limiter:  https://youtu.be/gcIKXqZyEOI?t=1

Low versus high cyclic rate SMG comparison test (Grease gun vs Kriss Vector):  https://youtu.be/1HlAUsWaahU?t=22

graylion

From: graylion

7/3/21

stancrist said:

Low versus high cyclic rate SMG comparison test (Grease gun vs Kriss Vector):  https://youtu.be/1HlAUsWaahU?t=22

interesting point. constant recoil would make the gun too complicated I assume?

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