The 408 fits nicely in between the 338 and 50
I seriously doubt that the 408 will ever eclipse what the 50 has already done.
Despite the stories told by Cheytac,

the 750 gr Amax still has a much higher BC than the 408 bullets do, they are only marginally faster than the 50, and physics maintains that the heavier projectile will retain energy and velocity longer assuming a similar bullet design is compared.
I fail to understand many of the statements the clowns in the video make. There is absolutely no reason that a 50 can not be just as accurate as the 408 . The 50s I build all shoot sub 1/2 moa groups consistently so I fail to undertand their statement of bigger caliber means less accuracy, that is straight manure. The 50s are still supersonic at 2700 yards, and I notice that Cheytac does not say what the energy is but I fail to see how a 419 gr bullet can deliver over 13000 ftlbs of energy like a 50 does.
Just for interests sake at 2700 yards the 50 still has 1985 ftlbs of energy.
They claim that their rifle is lighter than a 50, yes if compareing it to an M2 but there are several 50s includeing some of mine that are in the 16 to 19 lb range which is what their rifle weighs in at.
Some of the wildcats 338s will keep right up with the 408 out to any useable distances.
The biggest things I see holding back the 408 is brass is expensive and hard comeby and bullets are almost non existant.
I know of only 1 source in Canada that has a decent supply of both brass and bullets for the 408, but there are many sources for the 338 and 50
The 408 is a neat caliber it is just so sad that Cheytac has to use smoke and mirrors not to mention some serious male bovine manure to sell their product.