Thank you for your comments. Would like to give you and better answer, however, right now we are operating under a very heavy workloadI have shot the Lapua at 2,000 Meters / 2,200 yards and can say your goal using a 300-grain Sierra Match King will be very difficult to meet at sea level under standard meteorological conditions. I've used Berger and Lapua 300-grainers with marginally better success, albeit at 4,500 - 6,000 feet above Mean Sea Level.
I believe General Dynamics - Saint Marks developed a duplex powder to address your goal. I'm not sure whether or not Explosia in Czech carries an equivalent.
Our advanced 300 gr projectile surpasses the Sierra # 9300 Match King significantly. We will need to bring it into production finally, and only then we will be able to publish Data
The lynch pin continues to be a 2,000 yard powder which i our 1st focus but not fully in our control . St Marks and Explosia are both very good, technically capable companies and we invite any 2,000 powder from them or anyone else on the Frontier of powder development . If anyone knows any different, any information whatsoever (even a crumb), would be greatly appreciated