Take it to your smith and have a notch cut out in the front of the action... That would be an option. Personally, I'd call Cooper and see if there was any way you could send it to them, and maybe have them modify it for you?
There is 1 other option that would allow you to seat a bullet all the way to the lands and still be able to eject it, and you wouldn't have to change your barrel, just have the chamber opened up, and the bolt face opened up. You'd have to change out your mag follower for a short-mag follower, but all of this can be achieved for probably $150-200 (parts and smith labor), minus the cost of reloading dies and brass.
Read the whole thread, I think you will be quite intrigued...
6.5 ss final design
"I'm just a peckerwood who lives in the hills with too many guns..." - Bob Lee Swagger
"Give me a minute...I'm good. Give me an hour...I'm great. Give me 6 months...And I'm unbeatable." - Col. Hannibal Smith
Originally Posted by WildRose
The 284 is to the STW what a tricycle is to a Ninja.