Optimising Individual Weapons for Close Range Combat

Fucking how is that a strategic resource? You know this shit can made made from cheap processed garbage oil right? Sure the globalist climate cucks might be kvetching but it's not like they'll be sticking around for another decade.

Wiesel has tiny tracks.

7.62x51 is incompatible with modern doctrine, it's just too heavy to be carried in the bulk for suppression until air / arty can be called in.
An intermediate cartridge is needed and while I agree longer barrels would help the reason they have gone is to make CQB easier. A solution that has been played with is bullpups and maybe a downward / forward ejection bullpup is the way to go, catch is the mushy trigger but I'm sure a trigger bar can be designed that is rigid enough to solve that.

Why not just design your super intermediate cartridge to be specifically designed for a set barrel length, whether that is 16, 14.5, or even 12 inches?

The reason 5.56 is havign so much trouble with current bullet designs is that it was originally designed for a 20in barrel. Simply design a bullet for 5.56 (or whatever) that can tumble/fragment reliable from a 14in barrel even at extended ranges FFS.

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I could be done with the right propellant, I wonder how you would balance it for a longer barreled SAW or would you just cut the SAW down too and sacrifice a little range.

Properly designed, the extra barrel length of an LMG wouldn't cause harm with this "super bullet", but you'd design it to be effective in your carbine-length rifle. The extra barrel length of the LMG extends that another 300m, shouldn't cause many problems as long as the internal pressure stays greater than 1atm, which is unlikely unless you're talking an "LMG" with a 2m barrel.

You are going to want a whole lot more than 1atm due to the high friction of rifling but I get what you are saying, even if it was designed for decent energy out of a short barrel with a bit of flare but higher energy out of the SAW length.

You get it! As a side-bonus, firing our super intermediate cartridge (SIC) out of an LMG would be almost completely flashless thanks to the longer barrel, even without using a suppressor.

6.5mm SIC … I like the sound of that.

Yes, plastics in general can, but CT ammo must use the highest grades of plastic (medical grade) in order to function, and regardless of whether or not its made from good oil or bad oil, war always causes a change in the energy market. every time you go to war your bullets get more expensive, even if it's only to the slightest of degrees that's dumb. Climate cucks are not important, name one modern war where one or more sides didn't have their oil infrastructure directly targeted, oil is THE strategic resource.

We already have 7.62x39mm with perfect barrel length of 16", it can also be used in shorter barrels without a huge loss of efficiency, or 300blk, if you have an AR. We have 10mm and can have something that flies better if we want an even shorter barrel cartridge.

I always found it weird to have your short range or even CQB weapon use 20" barrel.

Due to legal retardation armies cannot use expanding/fragmenting ammunition, unless you do it with a 556 FMJ. We could think of something, but the cartridge is still optimized for a longer barrel. Changing cartridge or going bullpup is a better solution Preferably both.