Yeah Redding do list the 40 degree but it is in their more expensive zone. And then how close will it match your chamber given AIs are hardly standardized like SAAMI catridges. Whether Redding followed the Bob Jordan version I have, I have no idea.
What I did for mine was buy a set of Redding Comp dies in standard 6.5 SM and my smith reamed the sleeves with the chambering reamer. The sleeves are reameable.
The issue then is a FLSing die. I bought a centre bored die blank (yeah good NZ smith's can make them) from Troy Newlon in the States and my smith created a FLSing die from that. Only problem is a die made with finishing reamer won't give enough squeeze for FLSing. The die was electroless nickelled to build it up a bit and does the job, just.
I think Hornady still does custom dies, with you supplying 3 fired cases IIRC. A mate sourced his FLSing die from Hornady, also a hydraulic case former.
Not sure nowadays how easy it is to send 3 fired cases both out of NZ and then into USA.
As for reaming some of the other brands of standard dies, I'm not sure I would be keen to use a nice expensive custom reamer in them as some dies are quite hard, most likely a lot harder then a barrel.
Best discuss with your favourite gunsmith methinks.
I also know where the reamer is that mine was done with if you are interested.
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