@ Dan Warner and @ Badassgunworks.
So, first of all, I don't want to badmouth anyone's product. To be honest, I have a lot of respect for people who develop cartridges/wildcats of this size. It takes a lot of knowledge, time and money to advance such developments. Regardless of whether it is 14.9 or 420 Colossus or another caliber. And yes, your knowledge about building wildcats is 10 times better than mine. But let me share a thought with you. You are Americans. Why did the Americans fly to the moon on a rocket??? The Americans went to the moon simply because they can.
Regarding the 12.7x114mm cartridge. It may need internal changes/modifications to the cartridge. It may need a new brass alloys, or the same alloy as the 420Blitzkrieg to operate at 90-100000 psi. It may need a speical action, hugh tenon und may even a 2.5" barrel.
(If I'm right, Bartlein even has 2.5" thick ammo test barrels) And yes, it probably needs some premium components and things I didn't even think of.
But you guys aren't really telling me that it's 100% impossible to build an accurate rifle that fires a 12.7mm (750grain) projectile at 4000 fps???
maybe it takes 50" barrel to get 4000fps.
I've even seen a 416Barrett with 50" barrel. By the way, the old 15.2x168 Steyr launches a sabot projectile at 4700 fps.
The CMS 14.5x144mm also works.
But huge muzzle flash with short barrel.
(slow motion picture)