This is a reloading question, but it might fit here. The new 6.8mm military round is based on the 25 Remington. From what I understand, it is a 25 Remington necked up to .270. My questions is this, can you neck it down to 25 Remington. It is readily available and very close to the size you need it. I bid on a Remington pump gun in 25 at an auction last month, did not win it but came close. If I can make ammo easily I will buy the next one, I am a bit of a .257 nut in that I own 25-20s, 250-3000s, 257 Roberts and even a 256 Winchester. Shotgunner