Originally Posted by
ODL
It isn't that the threads are too weak so much that for a 308 can they are non standard. I will have to make a custom can and if I do that I might as well make the bore tighter and add your name to it since it will be a one off design.
If you want to get a custom can, let me know how much powder you are using and I will research the muzzle pressure and start the process. It will be dearer than a standard can, but you can customize it for length and even external design if it isn't too involved.
As Chris said, I can make it longer and quieter or shorter and not as quiet. The larger the bore size gets, the less negotiable the length gets to keep it reasonably quiet. The 556-45 Samson is really at the minimums as to what can be done. I basically added 25mm to the length of the original can but reduced the volume to 67% of the original.