Im more interested in the claim of a 75percent heat reduction....what kind of wizardry were they applying to the propellants to achieve this

What were the particulars of that 75% heat reduction?

They said it was all down to the propellant...didnt talk about it much.

Strikes me as a good method to lower barrel wear with rounds like the 300win mag

Numerically, your MPa to PSI conversion is correct.

But keep in mind that there a several methods of measuring  pressures in use (CIP, SAAMI, EPVAT, you name it; not to mention copper crusher versus piezo)  which can yield very different results for thes ame cartridge. Any numeric conversion gives you only a ballpark value.    

I just have published an article about textron CT cartridge at defensa.com

https://www.defensa.com/industria/revolucionaria-municion-vaina-telescopica

I would really appreciate any comments and above all criticisms

I liked it, but the ammo pics are deformed.

It is annoying that there are different ways to measure internal pressure.  SAAMI and CIP use different methods, and there are probably other ones used too. 

yeah, reading it using a smartphone it's what happens. Tomorrow is going to be published the second part

Some more NGSW Updates.

1. Encouraging noises continue to be made about fielding NGSW soon, with selection expected Mid 2022

https://www.armytimes.com/news/2021/10/11/the-armys-m4-m16-and-saw-replacement-is-on-its-way/

2. Sig is working to adapt its 6.8 SPEAR rifle into a civilian rifle, and also shows some potential variants such as a 20" and 8"

https://soldiersystems.net/2021/10/11/ausa-21-sig-spear-update/

3. L3 Harris displaying mock ups of its NGSW-FC; revealed they are partnered with Leupold for the project

https://soldiersystems.net/2021/10/12/ausa-21-l3-harris-next-generation-squad-weapon-fire-control/

And while researching the 30x113mm in the other thread, I came across some very interesting NGSW ADVAP news:

https://apps.dtic.mil/descriptivesum/Y2021/Army/stamped/U_0603639A_4_PB_2021.pdf

Project EC2 ADVAP: The Advanced Armor-Piercing (ADVAP) project is a critical technology development in response to the 7.62 millimeter (mm) and 5.56mm Family of Ammunition Capabilities Development Documents (CDD) and the Soldier Lethality Cross Functional Team (SL CFT) Initial Capability Document (ICD) which outlines the requirements for new ammunition to support the rapid prototyping/development of the Next Generation Squad Weapons (NGSW) under the Middle Tier of Acquisition (MTA) authority for rapid prototyping/rapid fielding. New ADVAP ammunition is designed to provide overmatch capability to defeat advanced light armored threats within typical machine gun engagement ranges.

The Next Generation Squad Weapons (NGSW) ammunition is split into two initial variants, the General Purpose (GP) and the Special Purpose (SP). The nomenclature for the GP ammunition is XM1186 and the nomenclature for the SP ammunition is XM1184. The overall objective of the ADVAP project is to develop and Full Materiel Release (FMR) ammunition to defeat hard targets. 

Also in the document is the development of One Way Luminescent (OWL) ammo, which we would likely see applied to 6.8 NGSW if it is perfected. 

Project EB8 OWL for Small Caliber: The OWL project is a critical technology development in response to the 7.62 millimeter (mm) and 5.56mm Families of Ammunition Capabilities Development Documents (CDD) and .50 caliber munitions CDD.

Current small caliber ammunition tracer rounds are a pyrotechnic tracer mix which allows enemy forces to see the trace round and track its trajectory back to the shooter. The OWL project's objective is to develop and field a full tracer round to replace the current pyrotechnic cartridges with trace cartridges that are only visible to the shooter and soldiers in close proximity, increasing soldier survivability, and increasing lethality by incorporating Enhanced Performance Round (EPR) technology into the new tracer ammunition. 7.62mm and 5.56mm are the immediate focus followed by a similar development strategy for .50 caliber cartridges.