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Chey Tac is working on their 375 CT right now so they may offer brass in the future but at this time you have to get 408 CT cases and neck them down to 375. Not a big problem.
Only way to get a rifle in this class of chambering is to have it custom made. I make my 375 Allen Mag, Dave Viers is supposed to be making his 375 Sniper tac soon. I do not know if Chey Tac has their 375 available for customer orders yet or not. I would suspect not since they still have not gotten the bullet situation figured out yet.
Just a side note. Everyone thought the redesigned Sierra MK 375 bullet would be in the 375 to 380 grain weight range, that will not be the case, Sierra has told Chey Tac that they will not make a 375 bullet heavier then 350 grains so all they will be doing is using a heavier jacket on the original 350 gr SMK design to handle the added velocity strain. That is to bad.
Wildcat Bullets will be making some heavy 375s in the future as well but that may be a ways out yet.
The 375-408 has alot more potential for military use then does a 338-408 simply because of the longer barrel life.
That said, getting the military to adopt any new round is nearly impossible so do not expect to see it anytime soon. To be honest, the 408 CT had the best shot at being adopted in my opinion simply because of its user friendly personality but accuracy issues killed that round and I suspect we will not see the military using any of these anytime soon unless its a special forces type deal where the men can choose what weapons they want to use if that is even possible.
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Very true about the difficulty getting a new cartridge adopted by the military. The only chance is within SOCOM. The 408CT was not adopted as it failed in part due to the way the CT folks were marketing it. They pushed it to be a replacement for the 50BMG, when it did not have any ability to deliver a "payload" as the Mk211 Mod0 ammo does. It is also exceedingly difficult to get the "Big Army" to adopt a new cartridge/caliber. I believe the Navy (NAVSPECWAR) is moving toward the 338LM, but you have to understand that this is already a NATO standard round, and already has a number of versions of Tracer, AP, etc. The folks at CT tried to sell the 408 as a wonder weapon, and couldn't get it to do the things they were claiming unless the loaded at 70,000+ psi, and shot it at altitude. I got caught in the middle of some of the discussions over this..... It is a very capable and interesting round. However, those who thought the US Military establishment would or should jump on this and spend the BILLIONS it would take in R&D to bring out multiple variants to "replace" the 50BMG were fooling themselves.
I want to build a rifle on some variant of this case, but there is no way in my lifetime it would ever replace the antimaterial capabilities of the 50.